Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac6964432c34daa…

MALICIOUS

PDF

73.7 KB Created: 2021-05-31 23:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1b6ee62f9f61a3749ac34e8f7be6dda SHA-1: 9c7f98b7ad81e3923998fb990eabf4eec01d9022 SHA-256: fac6964432c34daa14d574125e34f6e18eef1080757b37b2fa2d58713322cd39
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://unique.global/wp-content/plugins/super-forms/uploads/php/files/70b1ef036419795f80b62800af03fcb8/wulerosumobukudogesuluwet.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/d0bc5426a72f53dcd59b92b25c653d78/90623891406.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/7a409b47cc61afcd77a34bc8a31265d8/ligakenulediromafar.pdf
    • http://xn--aknmedikal-yub.com/uploads/file/kusegapugoki.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60cfb79901---jexelevebo.pdf
    • http://on-video.com/movies/movie_data/file/pemaviwixutujenuxizagus.pdf
    • http://texmet.pl/userimages/file/pazilon.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a90d3300b68---jazapulov.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/f72c41119a5f81fff44c4f330f84dbd0/29783368726.pdf
    • https://unosms.us/userfiles/file/99803899079.pdf
    • https://airbays.com/userfiles/file/77876467731.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fc325af52---guporelizufomuwebemazadi.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d180dbf8f3---bawadapusekeminiterepi.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/490tdmnu9v1hdaio8dp2rh7714/58860657398.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=sound+deadening+wall+panels
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e149.bin
dbe555786fd9f966055c3e65f70238484fc91891f4a3efafcfc674903d911a9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE149 5224 bytes
font_01_sfnt_off0000f33d.bin
cd770d93edb6ba6d7631289a4679525a5241ae3d5daf0fffd854340a9d7eb897		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF33D 11520 bytes

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