Malicious PDF — malware analysis report

Static analysis result for SHA-256 e80a678c67f20a27…

MALICIOUS

PDF

83.5 KB Created: 2021-09-05 12:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5cb7153e6b9efd65dcd0371a78f2a63e SHA-1: 60cef7f306150fbeca170bceef409d8cef642d1d SHA-256: e80a678c67f20a272aa6b46c04f4f09c85d58bb948bb79255edff77f3bf49bd0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://getrade.net/uploadfiles/file/84827263884.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/e4071af8656a56f286696ec7ebab6a78/69267895142.pdf
    • http://tfe-design.dk/userfiles/file/71115986481.pdf
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/21043231172.pdf
    • http://erfaspot.com/resimler/files/zutoja.pdf
    • http://usagimatur.com/files/others/9677462200.pdf
    • http://bbmeti.it/userfiles/files/zezezunufezudotelekavegu.pdf
    • http://nsdadventist.org/FCKData/file/mufawonidesofewodumo.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091d89b79d34---boxeveb.pdf
    • http://poltinka.ru/userfiles/file/fipegaxet.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160adc46750c55---63819938798.pdf
    • http://dynamicyunnan.com/ckfinder/userfiles/files/junoziropafejalam.pdf
    • http://kfbi.ru/content/file/55132896338.pdf
    • http://diversecityuk.com/userfiles/file/polif.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a97d75a38e---lijumekovigimikesot.pdf
    • http://rudolphi.nu/userfiles/file/nevojidasuxanu.pdf
    • http://thanhnhomdinhhinh.net/uploads/files/vonumukijor.pdf
    • http://business-baltic.com/myfiles/dok/xudafov.pdf
    • http://dfanchem.com/upload/files/5998180254.pdf
    • http://cen7dias.es/userfiles/files/rozes.pdf
    • https://drisraadentalcenter.com/userfiles/file/votajawevugebode.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=machine+design+deutschman+pdf
    • 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_off0000e173.bin
860a5e9201b656686ecc6db1bb64b575fd2ffd86443e08543372e9852111189e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE173 17800 bytes
font_01_sfnt_off00010fa9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA9 16792 bytes
font_02_sfnt_off000127c0.bin
f27180f4007475eab7a159d75e585ad6f93859c638a840b75b2680277859709c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127C0 10892 bytes

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