Malicious PDF — malware analysis report

Static analysis result for SHA-256 6091bf7284cab745…

MALICIOUS

PDF

87.6 KB Created: 2021-07-23 13:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cdebc954906e8c49ffb48ca9de8682bb SHA-1: 8ec03a758e5e7d541b1738c3b4a835ff9f512513 SHA-256: 6091bf7284cab7458a5640c4c9b1cffc1b70fdd1f1d354131d385b367e523979
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URLs imply the document is designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea4d38b9ae---muxurimejug.pdf In PDF document text
    • http://acecaalcoy.com/userfiles/file/42204955989.pdfIn PDF document text
    • http://dnepropress.net/files/file/15477498897.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/faronuwuvevo.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/64009845672.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/94a9ff23cceac09ed64f8a982298c497/91948089067.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/10709414208.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/7b20o988eq3j6f3h6nojkkg0n5/zagusetifedupib.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/wuginen.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/e6do1c5a05lkim8lgbgt008p0u/36211893579.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/3d2cdd02230b03383f64bc0dc501b0a4/56517954765.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/e419dab283b14b3090e4a21cc32649a2/jojinowivised.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608805a3324b2---31528112505.pdfIn PDF document text
    • https://soechi.id/userfiles/file/8435954503.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edd6682a7be---78244512364.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/sagurabomibovapa.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/ouea1paclc7htomb14n3eja9i2/sudugekemek.pdfIn PDF document text
    • https://areicon.com/images/file/48601664408.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/f9c4f2bf4e144ee89d3664f5eb1d7271/neliwewulozanonivugaveget.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/e997473c18926c5b0dcedc3c4ca663c8/83666881705.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a066969f2---4410449480.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/buzimatoxegagopekizumomi.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/t3m43m7fkn7e0gfqip8j49la43/mupebuve.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///pojokajizufiruzowi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=red+dead+redemption+2+mission+list+in+orderPDF link annotation
    • 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_off0000f1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C9 17256 bytes
SHA-256: 689d59286ff331bede5a005698cbaa9b1cd13018fc44e7bf738516fb30f35777
font_01_sfnt_off00011f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001371e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1371E 10720 bytes
SHA-256: 5726911cd977d57c57b1f91ca369900ccefabd345da3913495ff73d1bdfe38b6

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