Malicious PDF — malware analysis report

Static analysis result for SHA-256 325c6c31bbb4be57…

MALICIOUS

PDF

76.8 KB Created: 2021-05-25 10:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 886ff320d8bdebfe15611b494ae250b1 SHA-1: 75120cf028684efa7e503984a1f964bae614b5e2 SHA-256: 325c6c31bbb4be57dabaaedef76df4d0c022fd27f9d3a14ef4b29ebde032f367
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious PDF files hosted on various domains. The document body, though partially garbled, suggests a lure related to financial investment, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a83295ba5---fiwunugemojavoxawe.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608390e947e1e---zepivejokuwixutajobeb.pdf
    • https://cornerstonelaw.eu/userfiles//file/43466455750.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083721ee5c5d---90971315228.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/6ehfdk9ahqi54ved3vehr67s73/betowovexevu.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/r9ovn361p2a1d15q72edprrbu2/64970474467.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/9ad0a1d8d9eed3f9f4aad976662b14fe/pisezosekabitav.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160719c0b7be36---84841573167.pdf
    • https://vicotelecom.vn/static/source/images/file/lenabiwiwudofi.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/4a7b1f5di3pvcs6faa9vkj6hre/45262328999.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac339b46154---fudowefumijubamaxa.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/fb69cfb01fbe968d270a0bea66b22569/soxujegutefo.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839fd6b4c62---24153139508.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607486d6854f6---18009657533.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e32f508576---64803921881.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=em+que+neg%25C3%25B3cio+investir+com+pouco+dinheiro
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6cf59fa9c---39895223563.pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eae6.bin
809de94d9d8363bc82ac74c65461fb60951f086f2b20dc484bf59226a052d07b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE6 5524 bytes
font_01_sfnt_off0000fd4e.bin
edebe59a9b581cfa104941a4c5c5122a6768463ff56bf949f75a24d19ab803ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4E 12772 bytes