Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a84659cf91ae30…

MALICIOUS

PDF

84.1 KB Created: 2021-07-04 15:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 247b9011f8e1d59606c43dcb04433aa7 SHA-1: 5802440d55ccad22190f1178f616f7fad67fee83 SHA-256: f9a84659cf91ae3068f80348f8b9d6efdbb5da61c19cf53d8c527374ed4b48c2
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://kapelski.pl/userfiles/file/tixufuzumojuwuduv.pdf In PDF document text
    • http://artetendasud.it/userfiles/files/nodukarajerazubamofakarix.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/9b1ec0ff661a414062bd363bafbff618/6976928723.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/b0a049dd023c2581b77720263f7cdf75/2298937326.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/1306dd68eea211c8e072ab787e855c6e/topeda.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/23094757362.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/2534ce2c9a51bcfb20a2f4a3a4a30bae/28996804324.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/xawikibak.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/0f181f4d60b3c336e05db647ae2a4e70/86737022537.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c368b83c0e---56152525748.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f25b4e0a5---11127976267.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/5h499pp0ssovjc6vhurjntqkbn/77439188052.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/93727838995.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/a37c845d31c1534974100c2a42e83941/tuvedelutepetof.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c13430557f6---48590639979.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/mobape.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/4f5bfc208566617903c04118e5ef008c/bafekibemomegifedifoterex.pdfIn PDF document text
    • https://go2germany.ru/files/file/xerijubotizezedure.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/4fb5d078721868bb9ae75e518b4a70b3/zotaxunilanesokif.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/sarus.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/b097fcdde54284867df5ce3dc96b7622/97356772086.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e6db184e3abbd61209834b98c3cfa4b8/7828059252.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096f6df4963d---lalepapogomuvazibujoduzas.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/fovenativup.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/n1q8md8oamv35d732a89ekn4vk/bomijapejuzu.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/9137833420.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/70385839444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=mississippi+drivers+licensePDF 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_off0000e968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE968 16436 bytes
SHA-256: 84d904c3a5bebea5d30251823243077ff13cc24263166c3071eaaac90e0f6d8a
font_01_sfnt_off00011412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C29 10184 bytes
SHA-256: 778b6493ab1b38251a50cc85b0e9df8d54045dceeb41193bd08dc5185bb7001c