Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1c5202a124742d…

MALICIOUS

PDF

94.4 KB Created: 2021-07-09 07:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a91b5cf3279c156eccae0443d8146ec4 SHA-1: cce72e0c9dbe276ba313487760eb36f645d4ce82 SHA-256: 4a1c5202a124742d2fec94b6945df642654b2260151f2cae4f8014188f087c66
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a callback phishing lure. It contains numerous links to potentially compromised CMS upload storage and disposable hosting, suggesting an attempt to host malicious content or redirect users. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://pistant.ru/uplcv?utm_term=mkv+to+mp4+more+than+1gb PDF link annotation
    • http://radio-salsa.com/php/rs/filesupload/file/1987132461.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/vesegogakufum.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210609_501B9FDFE5924F1C.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/11aeed68861faedf0cbf00b83eed3326/lubuvonavabukeziburamofa.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b8eee00d0---70879733285.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609e32e50bb5f---48541495405.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087d26d8988c---59305289815.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/19147689856.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f16ed9772---85464434837.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088dd0eaabbd---fuserulema.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/q8qearteqp0soqdlebnl0k1ies/pijesazelirar.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160aa27f20150d---dovinefitobobetepegaveram.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c83003240---zitunevibozo.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/xemuxigufunodig.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/9de406aa42a5c10281324f38196a629a/zolananajajatimipawu.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907c91195c6---tolosuvadizole.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc5cd63cf6---vaseloditexu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/quujgsg0oh7e8bkce4bam0j07q/fuvakowajemomegexelekop.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/fudelajiwuzenokutij.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/1f55a00632a43185dee5025fb9500505/57822009910.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160868f6f1ea16---80084222203.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/49186181264.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/9240651973.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/vozeziloziratel.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8a1d42160c138a67e6a904db257019d5/76434086633.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/afdff15c6f3464ae15ebc2819601130f/gowupalawitubaxeso.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a497ba954---voxoxapazomanofidadepejeg.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12544 17908 bytes
SHA-256: 677cf0c85f4d65c6525d41765671fb7bf616e08df1b3b31644af626876027197
font_02_sfnt_off000153a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153A8 10816 bytes
SHA-256: 0a592317ed636f011d3d2f63640fa4a57f3fb253dfe173b425557de5dcc6b317