Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d1fb2526a016599…

MALICIOUS

PDF

151.7 KB Created: 2021-06-27 09:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a88503472f26ba3271c57d93b80fbf61 SHA-1: 90fbb42c793e1648e0203cb50e9fb2909e652788 SHA-256: 3d1fb2526a01659924b47b69f5ee518fa5f32ee0a0fe5f7287b312075e80ea5c
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document exhibits multiple indicators of malicious intent, including a fake CAPTCHA lure and a password-protected archive lure, suggesting it aims to deceive users into executing further malicious actions. The presence of numerous links to compromised CMS uploads and disposable hosting, coupled with ClamAV detection as 'Pdf.Phishing.Trojan', strongly indicates a phishing or trojan delivery mechanism. While no scripts were directly extracted, the document's structure and heuristic firings point towards a social engineering attack designed to bypass security controls and deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160799c6f712ab---zuseb.pdf In PDF document text
    • http://krevue.cz/UserFiles/File/zajekugoxupoxu.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc714c4aa57---bedejiteken.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/49375645297.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45888305dd---wodepapitagolowurapuvepaz.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d4491c65d---xumirodimenigunuwusox.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/netudelijed.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fea95e145f---pabanemonogizefujowugu.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/d39488a6a569c174529cc25e3ee9df17/viloxujujasusowef.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075802c0bedd---24281750121.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7b3121fbb---bemupawufokinofakibaxesor.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/2bacd85ae26711f3203902bd61ba4829/dalikuzud.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/xefokifororusigobufetu.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/dutimatamug.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090803931ee8---77744518905.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/dcd35a5743623e95f6ea75c56cb0f496/37822806642.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15417783654.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/xipafak.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/3fgio6ijnau1m5kc93ntpomsq8/42249332129.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/pimiferatuxodawalemi.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f99608220b---fazar.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/7cb1c95b055535e13cb0571230fd3231/25475228486.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad13426849---26595824693.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080cbd6e0c32---fovejidolivawiximorum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=neo+geo+emulator+android+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001da0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA0A 10588 bytes
SHA-256: 592364829a4cf3e1c37bd9428fd9509e2f23570093fb727c428d6493c7e72fa3
font_01_sfnt_off0001f1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F1FF 20740 bytes
SHA-256: 79d329456b3802fe18ce6fe53001867d89b2dcff2e6a476837ecadb68ab8b90e
font_02_sfnt_off000227dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x227DC 3968 bytes
SHA-256: 6c75b937025a22b4f0223345a0ea448325573fd2afcdd815078deea4c52ee416
font_03_sfnt_off000236b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x236B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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