Malicious PDF — malware analysis report

Static analysis result for SHA-256 91289686e761ec2b…

MALICIOUS

PDF

84.3 KB Created: 2021-09-22 14:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8453bf3ab33b9d5e455e5d4454a31c4 SHA-1: c78c148117e258bbf54bf5fc6732af1117c04556 SHA-256: 91289686e761ec2b2600f9c2b4319ac2a22f3b27195c6ab50157e312a7d7b325
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that direct users to external sites, some of which are hosted on compromised WordPress upload directories. The primary purpose appears to be to lure users to potentially malicious external content through a deceptive link structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.bc-arman.kz/ckfinder/userfiles/files/9491008605.pdf
    • http://net-work.cz/data/file/72676505093.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134155366e7b---4854376362.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137d96dbf240---43500110784.pdf
    • http://synerfreight.com/syner_upload/images/files/78454571653.pdf
    • https://himalmanpower.com/ckfinder/userfiles/files/79822566798.pdf
    • http://alemotta.com/resources/original/file/ravupubeli.pdf
    • https://dolaodong.com/userfiles/file/30937995800.pdf
    • http://susasoft.com/upload/userfiles/files/58963400603.pdf
    • https://produse-zilan.ro/files/nesaliropuso.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16145dc6c8ff6e---3572305309.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/a35f960f4794455f01e9980f29708dcd/dezuteginoruwixufiw.pdf
    • http://timavoshipsupply.it/userfiles/file/rigoralinakidelumabufu.pdf
    • http://abwmercury.com/uploads/files/tuxisizimomepej.pdf
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/34879554350.pdf
    • http://ltptech.vn/uploads/userfiles/file/rodazuratewowila.pdf
    • https://www.institutvzdelavani.cz/files/78329503769.pdf
    • http://wish-pharma.com/upload/files/99428320048.pdf
    • http://blossomtour.net/FileData/ckfinder/files/20210915_1F8A406C7CEC6517.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16137bb5d642d5---59103595232.pdf
    • http://bananamusic.tw/uploads/files/202109210828535597.pdf
    • http://drtamerturan.com/file/renegisupekanukoxilone.pdf
    • http://ctyhoalinh.com/media/ftp/file/kakazigibagikoboduxif.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=h96+max+h2+firmware
    • 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_off0000df16.bin
af9e481ec544cf4d22db809b46072ad3cdfbeea3df260751f76270e6475dfeea
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF16 10576 bytes
font_01_sfnt_off0000f742.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF742 16792 bytes
font_02_sfnt_off00010f54.bin
9cf898faa9e99b76bf7a492ccc5212eebbb3c36bc533b3bbac371cb7fa1a83b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F54 19924 bytes