Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f419d301bade08…

MALICIOUS

PDF

84.6 KB Created: 2021-09-17 10:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 3ea3366c7b8458ba6c304dec73f020d2 SHA-1: ac1c2f4ac1b2ec1de4628b89b8cb125dfc6d2db2 SHA-256: f5f419d301bade084a853d0173f715e050c074761e45e12b0bf5ec4ecfd27ed2
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URI heuristics further supports the attack pattern of redirecting users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/cdtrvvad9u5anmtc5cr00pecs3/wunorerogedokijivijalij.pdf In PDF document text
    • http://allineers.morefriendship.com/upload/files/pujemukewat.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/7dc1c4ff6b8c263fd43ada0923d8f031/78354286814.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/xitekoruseso.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/18130047262.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210903_D9D765228E06E35A.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/23587583026.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/muxabodomif.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/48756779548.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/tigisimutajome.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/tewisozujodow.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbf8a84f18---77047112362.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/jogikaniwunifokunilawi.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/1133013668.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/25091491780.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/janufatenu.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///bawafemajepajelidovuw.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/94560437057.pdfIn PDF document text
    • https://rafautama.com/uploads/file/47746797347.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/79974503557.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/pidofamapak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=rapidex+english+speaking+course+book+pdf+in+gujarati+downloadPDF 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_off0000e1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DA 18344 bytes
SHA-256: 2856d857a8fe36beb00cf110e8d070a4b04fa24ffea8533476b29a12f0eafe0a
font_02_sfnt_off00012975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12975 11596 bytes
SHA-256: c78ea9effc95a13a929a02cb3d9bee8ac936b4c31a9f5c6a4ceaa1b9d5f94720