Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ba951236d5f27b…

MALICIOUS

PDF

131.4 KB Created: 2021-06-26 07:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9fc8253217d8d1c0f2f2532b5ba470ed SHA-1: bafce186515867d57638ad99e98c0e0eb53e8097 SHA-256: 82ba951236d5f27b75de306543dadd03f82f037d0e537855dcb57a2f9fc09169
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating it functions as a link farm to distribute malicious content or facilitate phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856f608fa3c---pobebu.pdf
    • https://edusfera.pl/upload/file/2722607098.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/944e0794e00ca47f0fd47a07c6eaf2fc/40165209402.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/3bj85v6bvrq2oufc5kgs2hlekr/jatedogugojeji.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb7f585145---validow.pdf
    • https://fwullong.com/upfiles/editor/files/ximagejedosesoxisekojitu.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ecb0b84de---81605968186.pdf
    • http://zkojicin.cz/userfiles/file/niwakilajamufiw.pdf
    • http://ghioroiu.ro/sites/default/files/file/muxosuwoxa.pdf
    • https://asiajitu.com/contents//files/72426834478.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c01e45991f---xositenov.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac1c96942d---pegekunaxi.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c3e6a8d24---49256305683.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/he9l8198d57ptcvke4g9esqbt2/57306069881.pdf
    • http://short-story.ru/upload/file/vexujubikugoxadedigaleni.pdf
    • http://stark-tools.ru/images/uploaded/gopivegojesufitisesijel.pdf
    • https://harkakotony.hu/UserFiles/file/redabapumivipatodo.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/2cf82ba28ede219ee493957f6c8513b5/wevenoxoliruwatote.pdf
    • http://55pluscommunityspecialist.com/userfiles/files/93911385694.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/7unaq40avpf4qciqeai5d51294/waseginepalelevewire.pdf
    • http://accessiblevehicleservices.com/userfiles/file/53804661735.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d240833753e---28706542379.pdf
    • http://kxnjl.com/userfiles/files/95224270361.pdf
    • http://www.tomasjelinek.com/img/pub/file/nizabefaneker.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=onyxia+reset+timer+wow+classic
    • 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_off000195ea.bin
bafbe3c944ca8c9fe05d1a13826ef6e11a1a48bf5d6b789b64f6c08090fdd3f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x195EA 22652 bytes
font_01_sfnt_off0001cf33.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF33 16792 bytes
font_02_sfnt_off0001e74a.bin
2a8e7a0f3ec77817dc69d5206919aeb8a92b3da1f14b356949723a0e442c1343
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E74A 10716 bytes