Malicious PDF — malware analysis report

Static analysis result for SHA-256 24f84ce579972db1…

MALICIOUS

PDF

87.2 KB Created: 2021-09-03 19:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c41a6f9e55f2552b5a116eb640117929 SHA-1: 4339c66b6ed6795f3f76c72fd7b6fd51eef1508c SHA-256: 24f84ce579972db12998844aa6389fd1da09da5ad4d280e40ed8988bda18889e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a callback phishing lure. It contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to deceive users into initiating contact via phone, likely for fraudulent purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://huntic.ru/uplcv?utm_term=industry+risk+analysis+pdf PDF link annotation
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e75ad75843---4569529460.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/ropof.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/68123313676.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/79358348979.pdfIn PDF document text
    • http://valeneighbors.com/userimages/27087791077.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/dowirusalorumuviwatave.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/90587627084.pdfIn PDF document text
    • http://weclassof86.com/clients/6/6d/6dc59c75684a9be5e3a4726337e2fa3a/File/59193349779.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7fac31f32---79208178158.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c56c974b0be---sanewibanig.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/etvlf1gk683qvisgjmcngobvr8/31558568142.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/mapanirowuxisejope.pdfIn PDF document text
    • http://anninh247.info/upload/files/53282633195.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/9347384bae1a934d243b5afb229d70f3/62535527700.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/fumamodesukufe.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/a9b811f2a56c5bd3e6ac366cd1082a24/vipumekimuzizipuwof.pdfIn PDF document text
    • https://aromamarketing.md/img/files/67110829200.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1d15a7841---welurez.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c15e916afa4---56872786387.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/43296292814.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/kfakjdbr8q1ndbr08k33454no0/45336078577.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/rabavosuvasewufofusobi.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/4949910634.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/zerub.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/28441707719.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_off0000f41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 10496 bytes
SHA-256: 9d1abfa1d610128b3667d37669ec4cb72dacf61395c5b0b6b7646758b448b57b
font_01_sfnt_off00010c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C12 16488 bytes
SHA-256: a5812e50efe5fd03b761ff937a977e85f861d29dc3ee007ad43913a71137c7b3
font_02_sfnt_off000136db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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