Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1dbcef43e7c5b79…

MALICIOUS

PDF

117.5 KB Created: 2021-07-02 10:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5d8458a9cfc31b0a5a4b10ac862116fa SHA-1: 2c051dce51a3ba9c587f2c7c490047fab42d6de6 SHA-256: d1dbcef43e7c5b79ab390c6a9b9b50517f38fb6772b7dbabc4db483a8f984fa5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document exhibits characteristics of a phishing lure, specifically by presenting a fake CAPTCHA to deceive users. The presence of numerous links to potentially compromised websites and disposable hosting suggests an attempt to redirect users to malicious content or download further stages. While no scripts were directly extracted, the overall structure and heuristic firings point towards a malicious PDF designed for user deception and potential payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

Heuristics 7

  • 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
  • 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.
  • 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 http://ms-krmelin.cz/app/webroot/files/files/zarezarixomulode.pdf In PDF document text
    • https://llsindia.in/FCKeditor/file/17832582439.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5927ce01e---9839362293.pdfIn PDF document text
    • https://unosms.us/userfiles/file/24480213625.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b764badb67b---sibuterafifibogamimeputot.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/df35b7f2a8b016b5cc9fd5e39e8efa86/49325947458.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b070b5cce51---gunotonowaxev.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d86ed0d9ea---febeloxexat.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/72686340526.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/63755561551.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084a1d2f0d9c---zumedepi.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/61945471054.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/22130498776.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/ad31e4eae2c5d83c1076e4f86188722b/tesotot.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27404cbcf1---tunepugozizosawepoxer.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/9fa594c093772d950262bca0591a65ce/poxidenedizupifu.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/00e517ca5cd72dbffdc28b9e4731d8aa/tanofasisipuxobe.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/44430185101.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/2e40c56bd7469589ded3f41cf6a4718a/gixerimabukogefowev.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/doketesuxa.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f19381f9d9---judogonozewusaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=james+patterson+masterclass+free+downloadPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/ab5332aac7c58da0be4ac056f54dff69/81943472292.pdfIn PDF document text
    • 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_off00015cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000174f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174F3 10764 bytes
SHA-256: 13075cf53a8374fc723e65d72445ddcda529cb797b5b7ea1c5f36d12883c47ce
font_02_sfnt_off00018dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DC3 2044 bytes
SHA-256: 97a693020a9c67c913fa5abf5d83a61848c846aa130c5182d8e66f233602b60d
font_03_sfnt_off0001970d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1970D 17984 bytes
SHA-256: 335ce2e607ba2170bf7420a102ea1f23077236d4315f525f442f95ea7f366d6f

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