Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a089604e7aabbf…

MALICIOUS

PDF

80.9 KB Created: 2021-07-05 06:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a0a6818b765578cea5f475c4c4da9681 SHA-1: 664f8b6fe36296be90ee8f4b7143577435e9b71f SHA-256: 83a089604e7aabbff701566637c4ea1276fbc435b51b4f9757dac10e1c1dca96
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and an ML classifier. It contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://chcial.ru/uplcv?utm_term=meaning+of+expediate PDF link annotation
    • http://esthebel.de/userfiles/file/62780612253.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c942cef3938---numopapugetazuj.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/90773817053.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/61621918211.pdfIn PDF document text
    • http://standdominica.org/files/files/jupuzev.pdfIn PDF document text
    • https://afayl.com/userfiles/file/forudizolilanakigib.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4b921250c3---zutomafux.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/2bffe839c8621a41c53bc7d0e153e2c2/30303115767.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/l7n7574ad49jrgpst66jg7vt0d/23977787564.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/xiwapexikujuwojata.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac21cb7998---70334290711.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/34125312069.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/4da2538af8bb7a14fe9a9fecddac3261/94976571218.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/liriwubinewizotubitevig.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/lolajolakelagajipiki.pdfIn PDF document text
    • http://churchillreunion.com/clients/72216/File/60476920679.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/petuxaganudos.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/duzoj.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e2eeec02c---kumopewuvanipakeweweda.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/rivimobixuwuwoled.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16083272ee0ce3---5404438280.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/5870875.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_off0000d4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D9 10456 bytes
SHA-256: 391a2bc9438d86c683b141faa44b03603c47c0a73a14121c51a9bf88253f3d65
font_01_sfnt_off0000ec80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC80 18376 bytes
SHA-256: 489e1c609ce2b5c17a0c76bd750d0329454c9b3fff5e67eb1b55002ab271b21f
font_02_sfnt_off00011d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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