Malicious PDF — malware analysis report

Static analysis result for SHA-256 d910124f0d18b0f3…

MALICIOUS

PDF

73.0 KB Created: 2021-09-17 04:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 21189c0b0b81a82856f0a47434fe51b1 SHA-1: 356c40d7ab1d1ef119fcf77ef88f6cd3a285afa4 SHA-256: d910124f0d18b0f3ebc741505dea11571579d57ba612a6e36e0997d65013255d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious, specifically related to phishing and potentially containing a trojan. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, consistent with callback phishing or tech support scams. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to deliver a malicious payload or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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) 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://queure.ru/uplcv?utm_term=free+chess+ebook PDF link annotation
    • https://szallas-karpatalja.com/upload/55597677239.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/15c04489a4c6b953eaecd6ea942ae5af/rajepaj.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/83149977125.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/69965170719.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/zetok.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/narewaf.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/zimurapunidag.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/40743833028.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4eb83378d---koralitagovu.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/sixusubufi.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/mitugodewizimixobavesa.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/75422125919.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/487555a7b22289d4489cce95d6b3b2a8/mipepunifiso.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/pimugolimomogujot.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/gilofapugalawajoxomuxim.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/nizevezuxizajikaxor.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b053daa44f---74129635876.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/16064631155.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/63298087709.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16137f5dd486db---togakajezasifavatugumijo.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/gafev.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/sidibebonume.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/38002543793.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/61372175707.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000beb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C4 16284 bytes
SHA-256: 64c327b7dc323103b6ad1ae1b05966062f3d6af83a04191cc0b6bc6eb16b7699
font_02_sfnt_off000100a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A2 10032 bytes
SHA-256: 247d8422123671d23738f8f045fc2da615b5e3290b88454513703dbca1601fc2

Open this report in the interactive analyzer, or submit your own file for analysis.