Malicious PDF — malware analysis report

Static analysis result for SHA-256 215f245d4910ba1f…

MALICIOUS

PDF

91.6 KB Created: 2021-07-31 12:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7f79d891b871e1829bed83fe1d10a852 SHA-1: bfe1158aabd2cbe87aaafe42eb3332d3fd77bdf2 SHA-256: 215f245d4910ba1f2c55c282456b56186f3072daccda643fa7e70ee299dd8c31
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content. The 'Fake CAPTCHA' heuristic indicates the document's primary goal is to deceive the user into performing an action, likely clicking a link or executing a downloaded file. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://huntic.ru/uplcv?utm_term=proceso+comunicativo+modelo+de+manuel+castells PDF link annotation
    • http://efuegypt.org/userfiles/file/sejep.pdfIn PDF document text
    • https://trunglamdecor.com/uploads/userfiles/file/kivijeputegaveve.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c4526ecdae9635a1579e08994dee333f/mewejiridekob.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/vifomatanawodefepiwijux.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/49824079497.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/bosenizak.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/ke20rrbf9581mvt6opiru6un81/49531406107.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/50701619159.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff95f304e0---tebaviminov.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607787df85412---jixevuti.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/2c8b5ca9d3216a4c490ebc4fd1926f18/41353663085.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/59544926019.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/7dc38afd4c317fe6fcbf5ccfb006b913/64262538327.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/jiganewowisaduwedepi.pdfIn PDF document text
    • http://antiochhighclassof70.com/clients/4/4a/4a4d67c83f6236388cbe8d22d68d4f91/File/rosilororekilarelewin.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/88t9l46bv7emcipgdqdbscr7ft/xagijurotilito.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/39166383199.pdfIn PDF document text
    • https://autopratichesas.it/file/lolejegitadakufavita.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb24d464a6---1922651625.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071dce42d154---66861218771.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/252a6e02973102f5189eb22c5847e40e/85069419754.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/zisivaragenefut.pdfIn PDF document text
    • http://crabber81reunion.com/clients/b/b6/b60cf3d631ff247311937b5f15bedc89/File/xexufukega.pdfIn PDF document text
    • 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_off0000ffb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB0 10696 bytes
SHA-256: 72df310ac5ba6df952ad8da4b36c89e81bed993dc1b5c64f638d9f1559c55550
font_01_sfnt_off0001183e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13050 17788 bytes
SHA-256: a7cefdf398e9bdba39d0e6f9d92948f62994cfae1bdd2327ddd3a82e27b7abaf

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