Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d7398c0c0364534…

MALICIOUS

PDF

74.4 KB Created: 2021-09-07 09:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: feffc4c730d6b0ebec420eeedd32d4d3 SHA-1: 654956e78aa4b5cf008ab105d3b282112ec77243 SHA-256: 4d7398c0c036453442d39b05e7875ef94d9dd5da67b3d8be3500eb97d8403b31
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted, but the structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://king-pro.com/userfiles/files/latamexiwizapevugegoz.pdf In PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/47833678965.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093ff206cb1f---46688745009.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/nujosodosewamanov.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/zunitebul.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/63982508337.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/5c0008c13aca7f3d15a4ccda919af042/tupibusamanojijefeguko.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/49313456666.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/o40o4ohuuhmckom67ggt7sv8je/29322911851.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/46967382945.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95df74a8f---4960331061.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fbca71566---wuxiwazikelitewo.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160eca3006b5a0---75769321739.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/gakawawosugawizozatimare.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/53504001142.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/kirafinulizelanunak.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/52735025072.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/49609685538.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29de6b5501---98723246253.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/7198dc6in33evutr4ecsmrl9ql/6188391300.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/rabenorameresiwaserug.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/2fc23c13dca78a7733cf3abff55982e9/43019938248.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/naragezara.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f35b494e4bd---68993353091.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/togulolugusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=one+nation+one+election+essay+pdfPDF 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_off0000c235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC235 15900 bytes
SHA-256: 296c61b65cd0f29722cb7a9ad619e0b6c38974f24157d205d64fe1b067a27a5d
font_01_sfnt_off0000eac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC3 10652 bytes
SHA-256: b400edc8f67c01208d0f76d751d4a1d83ddee65899ab4d7c69d5d2353ed5823f
font_02_sfnt_off00010359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10359 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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