Malicious PDF — malware analysis report

Static analysis result for SHA-256 8374ed7208e855e8…

MALICIOUS

PDF

128.6 KB Created: 2021-08-26 11:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 97baf6fc7e117e44096a6b51018cb0af SHA-1: 9c1e37cd60e2bb7bc505282cef4d83de28154bc3 SHA-256: 8374ed7208e855e8df5c170dd73a57d60af74baddd6468e9b15a023fb27f8bfd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm on compromised or disposable hosting. The PDF contains numerous URLs pointing to potentially malicious content, suggesting an attempt to redirect users to phishing sites or download further malware. While no scripts were directly extracted, the PDF structure and embedded URLs strongly suggest a malicious intent to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://okeefesreef.com/ckfinder/userfiles/files/64868333266.pdf In PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a06b0b7c540---77359152997.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/60823884600.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/nuvexil.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/72256275091.pdfIn PDF document text
    • https://negaratoto.com/contents//files/19362065331.pdfIn PDF document text
    • http://teresachild.com/upload/files/45141751535.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/mexifixinemezafulivof.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/fitufanuzixirofigeta.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/tekogojudawevobesadut.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160705b5feb5ed---85296144126.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/2b41c237b3022ce0b3304d098d8f0c2a/48052374664.pdfIn PDF document text
    • https://www.espaciocultivarte.com/ckfinder/userfiles/files/biboz.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/a266911395c9ba8595a8d7e4ec312025/28682899634.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/2accccb506653dbadeca60da96bce19b/sibolidekodofogakukutis.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb9961eb5e---10806137574.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/32503444611.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/6009021092.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/0e7a640d30969fdefe012353c1827918/64816308494.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb4e609b91---nusiximonurofisozefedaje.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/vawiwexitogapuxik.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/c7505f60a0456bb5da2ffe499f4410d6/wutebodafokulapep.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c3444ac50cb---dobowapomipowegexadisofap.pdfIn PDF document text
    • http://pjcwyy.com/upload/file/furowuxobijubowufuji.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/2ceb948c5bd7e80df93c53f187bc226a/41903278913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=person+with+scurvyPDF 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_off00019069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19069 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A87B 20972 bytes
SHA-256: 99c870f982436880eb05e1f95aec6eade84937ba695ead840c49dfb1370984e1
font_02_sfnt_off0001dc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC7F 10488 bytes
SHA-256: 44cd9690b1d632b5789b2a827b4db809690eebf07d86ce1c2b6c063bfb917a7b

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