Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf6087b3cea7408f…

MALICIOUS

PDF

91.3 KB Created: 2021-07-17 14:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5eef991d51a4a6107e141bc747c85e79 SHA-1: 51b1802902b04407232bacf4176b7acce766b23f SHA-256: cf6087b3cea7408fbcd1b1e5a57324eef63e02681d7ea22b09d7fc66a3f7cade
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, specifically targeting their form upload functionalities. The presence of 'cmdknl0opldkb3e3na5s/buxajisokuvisizizo.pdf' within a URL suggests an attempt to disguise or obfuscate the true nature of the links, likely leading to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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/16074f91f6b025---605942851.pdf In PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608154c9903c0---13248527929.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/41d7de3c258389394441eb9e5542bb47/24216218840.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/a5mi16gk7bonnddaa6vupkbgn7/26043523867.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/o4g8k7cmdknl0opldkb3e3na5s/buxajisokuvisizizo.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7c0b3ba8d---82591887081.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a99af9aca8c---27085019893.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/1h28nr3vofdrv07hs7235kfbk4/vefobepo.pdfIn PDF document text
    • http://clarkhigh72.com/clients/3/34/34275c7d49a174b5f6cf03bf5966da6c/File/fevofibuv.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dba3f8aea7d---8450784832.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/5322823313.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7edeb1b669---22999222224.pdfIn PDF document text
    • http://livestocktool.com/d/files/41463704660.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/62415970984.pdfIn PDF document text
    • http://aven.su/userfiles/file/busuwaravukezen.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/suvirifojawulav.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/31655116858.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///17335509230.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c994d48952---95497999790.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/pomefugosuwi.pdfIn PDF document text
    • https://namlongadc.vn/uploads/news/files/vijumowu.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57468896470.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1624010664.pdfIn PDF document text
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/94404237.pdfIn PDF document text
    • https://notrepanierbio.ch/userfiles/file/82466073945.pdfIn PDF document text
    • http://jogamiskolc.hu/ckfinder/userfiles/files/musanejanore.pdfIn PDF document text
    • http://www.191seIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=which+verb+form+is+used+with+couldPDF 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_off0000ff72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF72 17616 bytes
SHA-256: 8b43d046a11acaab7916b662f39eb13e4c40e599a6b36baaa6b41c85cc775d02
font_01_sfnt_off00012cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14510 10860 bytes
SHA-256: 1380e423473dbcc0e41a9362ab09a16f28a1de09b33a3cb93cb64ac1cd8fb751

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