Malicious PDF — malware analysis report

Static analysis result for SHA-256 425bf51a9e3ac14a…

MALICIOUS

PDF

79.1 KB Created: 2021-09-19 21:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7ef09139e37e0e32bf0f0e3d2c388316 SHA-1: ebaa6800197a1727300538000c4cc6aae920d0db SHA-256: 425bf51a9e3ac14a69b48946e3f6ac0c5bbce97a376197bb4e02142e60c55adc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a link farm pointing to compromised WordPress sites, suggesting it is part of a phishing or scam operation. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to prompt the user to make a phone call, consistent with callback phishing or tech-support scams. No scripts were extracted, but the presence of embedded URLs and the link farm structure points towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161409d247d5f4---49726359722.pdf In PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/99246282051.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/77231172611.pdfIn PDF document text
    • http://foxadv.net/file/47408356620.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/tarujizomugat.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/17725954147.pdfIn PDF document text
    • https://iwistw.com/upload/files/rutoxeja.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e10eb1a541---farowam.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/64392155033.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/24188267201.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/68148353607.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/f65041f51a2e9b36f4266f4089a8c353/jewenegitumajurijag.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/34780632905.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/26382066234.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/24917689430.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613223bb74d65---gunaxefose.pdfIn PDF document text
    • http://underbutter.cz/download/foto/74636674895.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/kazofosejitaboz.pdfIn PDF document text
    • http://kaitianjinghua.cn/admin/userfiles/file/202109070632151385.pdfIn PDF document text
    • http://hbaoge.com/upload/files/63797789485.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/85341163701.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210919_52CC25DE3A4FE46D.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/givumidede.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/xekesigej.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/689a0e9c97ced178690720e5ae0f1111/9192849756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=hidden+downloads+androidPDF 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_off0000d16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE981 10220 bytes
SHA-256: f920383f30bd8868278ef56abe50f7e77e931594ecc8f9cbe17fac4dbe4f4f82
font_02_sfnt_off0001007f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007F 17684 bytes
SHA-256: 05dff46cbe2256e586d92ed0cdda6c910a18e2047857429ec1590db741154694

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