Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b963087d93e96d0…

MALICIOUS

PDF

83.0 KB Created: 2021-06-28 13:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ace3055940bf49eaf87f0bff82fe7af SHA-1: db5487957f41720d6f1e3a2f206d63fad2ff784f SHA-256: 9b963087d93e96d08c097ade34e97635d887f5a69975dfe85fcf01b8f13a29ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of an attempt to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb322b48ef---93739977049.pdf
    • http://resortvillairene.it/userfiles/files/sazifebogizasogaforagupa.pdf
    • https://sambelteri.com/contents//files/mined.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/dce1b509efdc79a7ddf0f0e814ba1653/vufosu.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-6-23/20210623103827245808.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ffc45dc5f---debejepemu.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/f8adf47edfbf651008b53208a7a0e515/78199815184.pdf
    • https://abeess.com/userfiles/file/dodiwi.pdf
    • http://muzycznescyzoryki.pl/userfiles/file/duxil.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cca3cd5b60---11912820129.pdf
    • http://omonetach.pl/foto/ilustracje/file/66253345417.pdf
    • https://mides.vn/images/ckeditor/files/wasinejoginozifinezif.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/2c2f87f0dce439bf269e81580905897e/80520147269.pdf
    • https://accu-split.com/userfiles/files/97939700361.pdf
    • http://aircond.md/upload_fck/file/31270283041.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/d65f6bcfc0815b6f5780b57de5f09c36/baduxikegamuwaduruz.pdf
    • https://coastalstudio.com/images/main/file/xuxezinedejox.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/9e91dcf28e9dd71b5fe3607b1f125523/93522171848.pdf
    • http://clingac.es/d/files/5709481916.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/465960a0833ce41752ed03ed4c19aca5/63346441824.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a52495ff6f---66494276186.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=black+ops+zombies+ios+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfda.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDA 16792 bytes
font_01_sfnt_off0000f7ec.bin
da5681e0380ae3bb4b89c13fbb1962f1bb1d54fd7a67ad53236619c53a7ded39
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EC 17728 bytes
font_02_sfnt_off00012664.bin
204f384a206237765ec5408adb2bf659e32afe9b6b46956be0e3ff9cfca349cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12664 10784 bytes