Malicious PDF — malware analysis report

Static analysis result for SHA-256 36c331e53f631e20…

MALICIOUS

PDF

89.9 KB Created: 2021-07-01 12:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e9280047f92f1fd0d40806469864496 SHA-1: d0f1eb92ca279d3f377d56f0107e767055921f7c SHA-256: 36c331e53f631e202a226ece2bf8b7095cb14e4ef7b6ca12114d382e61b2ea68
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://medvor.ru/uplcv?utm_term=poppy+seed+layer+cake
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42e74d1d4f---70312682576.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/mtf8shj929fnjhdidcjlau0uuh/lovaw.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789772a1e59---94439899025.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/5qrits4qelhgmac4qe2r69ufr3/vexekiramavubejuk.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c87235ea200---92732608696.pdf
    • http://progfin.pl/userfiles/file/gedorizo.pdf
    • http://accessiblevehicleservices.com/userfiles/file/20577486163.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa38c3e1f7---sutuwojabutemitolixanojad.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/8b5de7dbe64c6668686b72ed4d68f9c5/56383050666.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918dbcd9242---56846184957.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/22vcr7pd9mk6l96osuktt423e6/jogilibozi.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b73a4c282b6---61091287456.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e82a185ef1---xuwabuki.pdf
    • https://nepalipublisher.com/ckfinder/userfiles/files/80656432487.pdf
    • http://autohondl.cz/userfiles/file/35884319696.pdf
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/32618727571.pdf
    • http://chickendaylacrescenta.com/uploads/files/33221313055.pdf
    • http://ltptech.vn/uploads/userfiles/file/52811096541.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/gvus6sch8nf2rjp3ckri3kp2l3/25971123487.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/n2c4avku7afouniknbc4dmjcta/dibibelifelijusazozodaz.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2b12ab88a---sasavivezoxilenibelud.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/f0f68fd05fea945f2cff5dff4a7d45e9/78314643630.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/934a40062b8e8549cee008475c687841/fegokunuzixosixi.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7d1f4c1d8---44107642516.pdf
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/3b1n2em79t74chkka3m54ufhj0/gilejijidexoviwurezagero.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_off0000fadf.bin
6ebdb3ab0cf2def4bc66881461097e1a5ae9ed7108ca21d3fa82adfd86fa5506		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFADF 10420 bytes
font_01_sfnt_off000112b3.bin
6c4445218a7da5640fa7db796e8ea0ddba829bd1a43f15b2793631547dd0262c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112B3 18292 bytes
font_02_sfnt_off0001425d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1425D 16792 bytes

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