Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd1553dd4cb18549…

MALICIOUS

PDF

93.0 KB Created: 2021-07-26 01:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a00ae3b874c4dfee0f91b6324474be4 SHA-1: fa95ccfd94372b293cd762a6f752228f77a1fe12 SHA-256: fd1553dd4cb18549fa0f484b96c49672bfc24f818eafff875666d2bc134a4360
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/3249614256.pdf
    • https://pfhotel.gr/ckfinder/userfiles/files/rebebaka.pdf
    • http://monkey-do.net/userfiles/file/43264749864.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2708cd38f0---71936993533.pdf
    • http://bobiniauto.com/userfiles/file/vutologumafirowutuwotabe.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/jsqiu1e6u3670df0vbsibp57bi/16136036562.pdf
    • https://stef-nancy.fr/upload/document/wivotibivobixoliruto.pdf
    • http://akinmedikal.com/uploads/file/kejarovisigad.pdf
    • http://24cvety.ru/upload/files/59810056911.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3e10a2327---sewikoxuladozuwe.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/cc175e6dca24b6757a903cf1d3686afa/6081755905.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/f3f792fd2121a226d167300738aa6ae7/72252178631.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160983afcaac30---83302305328.pdf
    • https://mojer.bg/files/56050607702.pdf
    • http://asesorgubernamental.com/images/file/tapelolexepefokaromiwarax.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/2kg1lbt1dnd11h5to7rb0gl7v3/loguvodalosifaligivedone.pdf
    • http://www.hmh.sk/files/articles/file/29369855737.pdf
    • http://skolicka.eu/foto/images/file/gejaxekirexatowisel.pdf
    • http://kripasec.com/userfiles/file/mukurawesapepegobi.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/upmhprigq0b0dun7cj85vvhf55/84143915150.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608afbe470c77---82331409115.pdf
    • https://masihpt1.com/contents//files/tolifuweluw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=rolling+stone+500+greatest+albums+list+excel
    • 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_off00010395.bin
df52e76bfc7de3cfe9b3b2e4f6d663fa30a772c618aa2f4174f09b9284ef47f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10395 11216 bytes
font_01_sfnt_off00011de6.bin
3383cb393175c7b0dbe1b826726863634cd320b1eec2c427d874fd73eb0b135e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE6 18008 bytes
font_02_sfnt_off00014d2f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D2F 16792 bytes