Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dbb7c0087cc9f9f…

MALICIOUS

PDF

83.2 KB Created: 2021-08-21 01:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b61733fbb7b74cce62c8b18f7c813792 SHA-1: 244d8ef391791fdbfc1ec64dfaefa0df8767c385 SHA-256: 6dbb7c0087cc9f9f963f71d5f29037780311ec509ea9cf06c853c4541c8b9cee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and potentially disposable hosting. The embedded URLs suggest a phishing or SEO poisoning attack pattern, aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2a2277cc1---25002127683.pdf In PDF document text
    • http://gpsputhuppally.com/userfiles/file/2022554237.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/webipuwezenones.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/5a72f668011ce64afafe3fc4881a56a9/gaxetazuz.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/429ab5b2212805776f423598f075c677/ragofegi.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/larelulewinive.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077719acc7b1---koxekepusopi.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/imk0ka3r99gic763b06ijq4ekm/dojofizu.pdfIn PDF document text
    • http://balone.net/_upload/file///96119075136.pdfIn PDF document text
    • https://tepihtrava.rs//files/54029687444.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/febopom.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/64346482653.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/buzogeb.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/ae3gnei8546vclhac2fbi3sjh3/17588246075.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/72195945930.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc8051b2b---77097766280.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/77528508503.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/55238200571.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae315e27116---53131969492.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/sesofodoguzijonen.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/k9gn6fi9eb7ot1o8u66cv2k5b6/46188156304.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fc43938dc---31320424299.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/41014407301.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/50595333411.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/kixatuwid.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27004c5408---lakasutedokuwakizum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+reset+mxq+pro+android+tv+boxPDF 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_off0000e11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92F 16976 bytes
SHA-256: a7ec568d74ee0e2139f354caf6958b60f33ea8b45b8f8e8a0a8994153ad351e0
font_02_sfnt_off000124e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E4 11036 bytes
SHA-256: 893d97150f6eb191831fd596dc4a2dc1cffe99d3212f5090ece0e9703d128957

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