Malicious PDF — malware analysis report

Static analysis result for SHA-256 875ddcb322d5b15d…

MALICIOUS

PDF

85.0 KB Created: 2021-06-30 02:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45b5357c677a4ef509a58ff7f1bf8dbf SHA-1: 6c7ee08d3b9204c18b5177b68956eb7bb702da44 SHA-256: 875ddcb322d5b15d5a839be625c05f733dce94b961103d0e8d6356afeae4ef6b
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, and the document body was unreadable, but the link farm nature is clear from heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://jfhcoaching.nl/userfiles/files/xanuvitikexibosobak.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9980d75bd---66345504162.pdf
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/37529513504.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/sk4f6e8qeo07ldcuirqj5j61rq/82916691920.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/siqvuuqb3mlg1jk6il7k5lrnok/kilekinufegenadowikudosa.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/bbcngb9cl3klultrmanlgs2ea4/50486933562.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073edea7743b---82285774926.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/d328fdc0b54920b6659e6b55663bd4df/35243243615.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160967e24e5736---papaximoberiganowitunew.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb9f564859---32339246562.pdf
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/mamilinitunogagubodine.pdf
    • http://bscartridge.com/pic/43139867093.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071dbec9b06b---30370951736.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/ce693c610413f892e0108c9a2b3835ce/36410139831.pdf
    • http://afgventuregroup.com/cfiles/file/vamewefisiresu.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/447b9552a6994378b1094ca195da6b80/kolumewusomaxix.pdf
    • https://liniagdanskzydowo.pl/files/bigupapo.pdf
    • https://ka-base.no/images_content/file/44215140332.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ce14ba4b9---93578912590.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed1c11ded9---24982780516.pdf
    • http://mikailang.net/userfiles/file/20210601080014_1351879134.pdf
    • https://zlato-eu.cz/upload/files/fewalavazuzumin.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=lifted+up+crossword+clue
    • 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_off0000eab3.bin
842a80ac59856d69869f01d9dda75a5a86d5f3c5d99f6e502a59d720b3af2b5b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB3 16840 bytes
font_01_sfnt_off000116b7.bin
452a327913f3923ca982ae5787918cb88e8c9e30c6dc36ea89b8ba5ff7518b0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x116B7 10492 bytes
font_02_sfnt_off00012ec1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC1 16792 bytes