Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e008fed4792a251…

MALICIOUS

PDF

68.2 KB Created: 2021-10-02 01:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 79a8a46b7b0ba3b031d1685c8a3eec21 SHA-1: 02ed787b320fa4d0416232131733a8c4b4b48491 SHA-256: 3e008fed4792a251ca4eab291e0e57e9031e463ba344e9257d2a7b54ed621e11
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a phone number under the guise of a billing or security issue. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to direct users to malicious content or initiate fraudulent phone interactions.

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 http://xn--2-140-swe8h.xn--p1ai/files/guwenip.pdf In PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16152863c807be---mabinugizujinapomoxagozuk.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/99255664161.pdfIn PDF document text
    • https://mavibusiness.it/file/38173134923.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/fikugupox.pdfIn PDF document text
    • http://ore-processing.ru/d/files/80675633723.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/de22f2c3f4c410048eee4ec2c7640b2b/99973562790.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/8002878012.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/19064967100.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e1694e4d3e---5791887875.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/84652177146.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/2863790843.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/sofogake.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/33191773438.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/50965964832.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202191356335430.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/dizozezilesenubovebime.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/pozalozilagexiketolano.pdfIn PDF document text
    • http://kco.su/userfiles/file/luwenakax.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/97102289779.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/69214740249.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/218efc6de81071545849e802f3980697/vikirip.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/dofanetufuvilifigezi.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/94642246253.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/kupaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=word+apk+premiumPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F0 10320 bytes
SHA-256: 4e45ab66f7bf1c9a8e393ff3b464d6ecd98fee595fb40769ef5660fa39ea0738
font_02_sfnt_off0000df2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2E 14568 bytes
SHA-256: e3389e2d7d8067f3e7a3ee2ba01623ec6e6f6b184de26edb7f4269c864d330f1

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