Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b3ff4b8e003b346…

MALICIOUS

PDF

68.4 KB Created: 2021-09-06 00:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b7efedf787a1db014f85d655016206d9 SHA-1: b0059e9bd06967fb975e5fe78c45ca6068e0bc8b SHA-256: 2b3ff4b8e003b346d56134ceb4bc0f887dfc03ad00d5af89527bfa2b3075dfac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The presence of multiple links, some with 'utm_term' parameters suggesting tracking, indicates an attempt to lure users to potentially malicious sites for phishing or malware delivery.

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://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://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_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