Malicious PDF — malware analysis report

Static analysis result for SHA-256 483b9f2655ef644a…

MALICIOUS

PDF

82.7 KB Created: 2021-09-05 16:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b0288a38d641330d140ceb3b01f9bfa8 SHA-1: e744795bb9e081f883a130874a56e450f83350f9 SHA-256: 483b9f2655ef644abe3454ef9cde8ff34b4704a61e325c06d7d6f241232c74e5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or are part of a link farm designed to redirect users. Heuristics indicate it's a link farm on disposable hosting and ClamAV detected it as a phishing trojan. The ML classifier also flagged it with high confidence. No scripts were extracted, but the structure suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://signauction.net/userfiles/file/39375849643.pdf
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/10488996487.pdf
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/75116569401.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16097cd2279b46---vewaxugilutuki.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/dddab8bf8f0038f7587043da8c464cd5/bolaviladuxixetamusafekok.pdf
    • https://abe-rdc.com/userfiles/file/gudujivifitosifevazexonop.pdf
    • http://yaqeen-eg.com/userfiles/file/28180396489.pdf
    • http://iwilldoit.ru/uploads/files/files/10953938400.pdf
    • http://argol-editions.fr/userfiles/file/26169031268.pdf
    • http://centrlita.ru/archive/image/file/mopanikesanuzimixanudawiv.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/87q5sn3fvkncgd8di8i23a7pl4/79179415425.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efc73b09cf---zixodopunizigawamun.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/qimom813p0gp899bmsvac7l5u5/96679239865.pdf
    • http://technoculture.cz/admin/upload/file/78708149866.pdf
    • https://tungqibiotech.com/upfiles/editor/files/40352751175.pdf
    • https://erdemlerkoleji.com/resimler/files/40222930390.pdf
    • http://thebookmarkcafe.com/uploads/files/putujo.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/bc2d897b5c709ae6ad782351c6500131/jugovojowapaxofogaxilux.pdf
    • https://turdv.ru/SITE/files/editor/file/zawitatajexose.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe53858b38---sewegavamisagukifudo.pdf
    • http://dailygiasi.com/uploads/userfiles/file/nosidu.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f6d643fda---wisalimisu.pdf
    • https://gcr.goldcrownresort.com/magazine_files/files/labemokumupiso.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=credit+risk+modeling+sas+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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df24.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF24 16792 bytes
font_01_sfnt_off0000f73b.bin
4bfcaf4cf4a9c112437bf6fc70a46aadb77c665688fa7d94d04a9bd100330462
pdf-font-stream PDF embedded font (sfnt) at offset 0xF73B 10964 bytes
font_02_sfnt_off00011076.bin
8c49b46e97591eb129f7484c50bad7a7cb2d2e0b64ce5dde4ff05aa38dfb1ce6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11076 17476 bytes