Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e9fd5fb5115c83…

MALICIOUS

PDF

66.8 KB Created: 2021-09-06 00:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8175c3be157da6c16f530c93e1179be0 SHA-1: 2059cbfcbed6e9a83cb6a2b0766e6d7f62ac7b92 SHA-256: c5e9fd5fb5115c8364e1709f696b340e6b36211d703850bb180656bb142b8b63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites, some hosted on disposable domains. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an intent to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://meetburgerusa.com/uploads/files/22332390045.pdf In PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160861862e3d44---91808876625.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf05f0b3765---87906416918.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///gajupaboveber.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608467a19d5e6---wolijurenofaleraletekawi.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/fb28325eed4bb1059792872f8ec27564/67065757106.pdfIn PDF document text
    • https://x-software.cz/data/file/11181145561.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f2c312948---nawonatapemor.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/xodizino.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/jerulidebepedu.pdfIn PDF document text
    • http://hzdshg.com/images/upload/File/46514290376.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/butevisopaginonabif.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/puzetidagisaka.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/67091540412.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/14m4o6k07nnbnl9fa4g34iouq8/2230200436.pdfIn PDF document text
    • http://wajl.net/img/file/20219343025.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16087833614f50---bawigeralojirugabut.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/875b1ad372f0a63837b03425137e761a/57924922419.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=job+vocabulary+printable+worksheetsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#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_off0000ae6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE6E 11060 bytes
SHA-256: ed878310aa3b57d4577c3a8b9eb5d630b0b3f8eebc02262bc3d3278b70ab439b
font_01_sfnt_off0000c809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC809 14628 bytes
SHA-256: 3b3f5ea71f3c99e543ac8bbef40aea6f4c53bf23cf708b72b8d1a6199a6f4542
font_02_sfnt_off0000ebee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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