Malicious PDF — malware analysis report

Static analysis result for SHA-256 d94fad9b8dfec433…

MALICIOUS

PDF

99.3 KB Created: 2021-08-17 21:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 93ffd3f58b39e224622906d20b4e4f39 SHA-1: 6d12149aa194036c9438af28ea26d05001ac61bd SHA-256: d94fad9b8dfec433739d84b78db34409a7defea8152678a8d67de8a74435dea6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, with a high risk score. Heuristics indicate it functions as a link farm, pointing to multiple distinct hosts, some of which are hosted on compromised CMS upload storage. The embedded URLs suggest a phishing or SEO manipulation tactic, aiming to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • 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.
  • 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.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f325b1172b2---44451616919.pdf In PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/kizusatevabaroje.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/43677973318.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/42675090080.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/puzazowisanapovus.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/81320321341.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160796c28872bc---zigagofuzoziravol.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/moxewaxofatabopozewovutut.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/29726057075.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071042682812---28787166476.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/xavemimulasirinud.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4944d9208d---58942600053.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e2d1c0e856b---47287561736.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/14396553259.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cf3b52808---12574079277.pdfIn PDF document text
    • http://lejuriste.ru/files/file/jibemukusunufado.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/loxipi.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/97579124747.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/78054539327.pdfIn PDF document text
    • https://phr4u.com/files/67137373806.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875ce43cc43---poditudetotununa.pdfIn PDF document text
    • https://churchboys.org/userfiles/files/50589215332.pdfIn PDF document text
    • http://pitneyclan.com/clients/c/c7/c7afcfad87c307b096642b2e35f52d25/File/45805828390.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/11695640629.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b974d08cf4---77081948655.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=contrato+arrendamiento+minerva+descargar+gratisPDF 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_off00012011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12011 10764 bytes
SHA-256: 5ae269646755b993ce651cbffb72b7c5efee14e38a6b1cac645fb4d4d3ee6b94
font_01_sfnt_off000138b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000150c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150C3 18496 bytes
SHA-256: 46f5eec84885bb99d1f2ac73cad2925f2801726ba385e696ef2c54a2d0120d6a

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