Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff9ca03f942d0fe…

MALICIOUS

PDF

91.8 KB Created: 2021-08-17 20:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4c111dfc5c193e1ed490ce13ee4139f5 SHA-1: a84983c546b4859dcecb105b1202f852d6d63f35 SHA-256: 7ff9ca03f942d0fea4e8b09f3793c289cf034c899bbd3e6c09f6a709b98dcbee
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://bearings-home.com/userfiles/file/taxof.pdf In PDF document text
    • http://nutronicltd.com/userfiles/file/javedolanawamo.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/37284907629.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a554cacc321---gadedos.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/6886222288.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/nirosudukufikabokirimab.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0c656c10f---gusavowonadiduwi.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/61907207093.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba2672389f---dazikikiruwibobodo.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/38662324337.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/jozop.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/7fcff815c70b12ecaa047d422dd54d18/kudugerikipinakatobevo.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/86145593221.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/rimufuve.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/75743637006.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/25076196900.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/86767961064.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/85732255288.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/sezeboboluwujoberofumig.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/suneledaxunizexaxanifij.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e4325839c---59439032989.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/8876585691.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/f9923a9147b5f35d48ccc6858aadca70/komopabupune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+start+a+heist+in+gta+v+story+modePDF 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_off0001027f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A96 10908 bytes
SHA-256: a7d91c7063d5abaf4b9e82829862689fefe4444c35e56300e0f6c66ec38c3514
font_02_sfnt_off00013376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13376 17136 bytes
SHA-256: 82ff1a4187e9e63627ce20e9ad335acd99e58635426f4844c5c1502249865a3a