Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6cccaa6bd1bb01e…

MALICIOUS

PDF

64.3 KB Created: 2021-06-07 09:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3082775edab40fc8a0a2d8172fc7e682 SHA-1: 47057bad6a48ff7b43b6371a45ae6ce29db8cb38 SHA-256: b6cccaa6bd1bb01e8f5d6f4944c9bb89afd01ba068f994ff9b9e5dc5d1fad79e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier indicate a high likelihood of malicious intent, specifically phishing or trojan delivery. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of external URIs points towards an attempt to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8702

Heuristics 5

  • 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
  • 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 https://queure.ru/uplcv?utm_term=banting+7+day+meal+plans+book+pdf+download
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/3be7580997a3f47647d45e7e665c5b4a/povosogavubaziguwaz.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hk9r513hkpk1e6n2aljjfnc5p5/96633431584.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/28a92474722972bb7a6ca3289568a2bd/84569278940.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/f6u92ae2vnbh59clsd5df18fmu/nepiruxasufiw.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/1d5a71dcdc9a5f511fca5bee79683197/vikenagubakivafitodaruj.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/816a0bfdc493d50917dbdb9659c38b16/xizojirozezowekekovopos.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0c3f50eea---98035525270.pdf
    • http://garmagostaran.com/Upload/file/jejazupadumirifar.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608695bace855---zijovenabiw.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/hvadtjkv1l14fsv4n3r2g3vig7/30335690011.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/eb5772ec2ee0def86c34cc83e49fef90/6180139296.pdf
    • http://adria-ex.com/images/blog//file/pajitulovi.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e39a899b8d---6322100234.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/rs34rdurgtuverf3g1mcpi60u5/51570048419.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/05evsa4ujpeo391l42t9l214c9/18079267974.pdf
    • http://bocghedanang.com/media/ftp/file/totalemepeve.pdf
    • https://ludifrance.fr/userfiles/file/78618891959.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da1b.bin
d87ffca9fdd31ee281cd60c9eac01b15d08cf69d77fdc8a7eaeb80fdd84e2c1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1B 5792 bytes

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