Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd391a729a5a0130…

MALICIOUS

PDF

83.9 KB Created: 2021-09-06 19:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 376b3885c260a3e3a0904c4389e11b3e SHA-1: 94371740d4ec9801af405e4f69588ce0ec62abcf SHA-256: cd391a729a5a01300200d290ff5f1a82470fd8333efe2a9c4c7cf8e8af9d85fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, several of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607975b278461---tireneka.pdf In PDF document text
    • https://huaku3c.tw/uploads//files/202108120153523645.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1db900ae50---movikiv.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/fofejobomeludetofowuge.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/15671687525.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/jazobowokuriregesosuw.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210811081517.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/podejonim.pdfIn PDF document text
    • http://hnht-electromagnet.com/d/files/65476592340.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/49443835803.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/resuvidi.pdfIn PDF document text
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/sovabebulebibegunudimona.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/8doomr3ekr7isdmgmpe0hnioer/senobenijomope.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/27759101540.pdfIn PDF document text
    • https://liderpin.com/calisma2/files/uploads/pasumetabomuteretusu.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/8f08f8599f1cba34db39b7d704d18bea/72510469928.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/likewib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=wortschatzerweiterung+%C3%BCbungen+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_off0000dc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC68 19676 bytes
SHA-256: fa662a4ffcddabdd4a1474ecf6695b051af4f89e7353f05e003bb283675494bf
font_01_sfnt_off00010e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001266c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266C 11424 bytes
SHA-256: db00e8ed15adea84811222146c912e793759df56a7ce2a03f64a9352901c43fe

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