Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5874833f78fdc70…

MALICIOUS

PDF

84.9 KB Created: 2021-08-16 10:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e6ad3e00ed0fbaae018932e6010789ba SHA-1: ac3ba5d39fbc3ab5161dee39c50378385d1fb9d3 SHA-256: a5874833f78fdc70b44e318dad31b7efa7647cf753be583c582ed4b8bd7bc06f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely intended to distribute malware or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://trotusgrup.ro/ckfinder/userfiles/files/sikakezotejilugetetixo.pdf In PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/166273335f49e003f6f3cbb1e1dea27a/vapujikadazeg.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/41551302535.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/079cdf066c9191b6d45ca443165ecf5c/94950072107.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/viwopunogofodinalomu.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c16c240f0---21886486216.pdfIn PDF document text
    • http://princeverma.in/uploads/files/97769710921.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/68e7b47c3a7fdd1426c0f759ed5b3a8f/purizivu.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/5885b155810faf0d1faf7a2b38e6d925/51325666846.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/18505148197.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/acb9cce25632c617bc4ca7c788a4e49e/14025952988.pdfIn PDF document text
    • https://ecoretras.com/file/47639450712.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/dutupaw.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/pesele.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1610067793457a---95623745568.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210811233753.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/waneregixirotetalaxo.pdfIn PDF document text
    • https://nexusmediation.nl/files/pagukakuku.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/f5085121309cb8f09ffe5cd1ab67477e/ponirinutitixa.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/98575896147.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a044f492eef---xufor.pdfIn PDF document text
    • http://allycatering.com/userfiles/sedofetanokirunuwano.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/lemixobidesapofevog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=watch+movies+online+free+full+movie+no+sign+up+tamilPDF 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_off0000e570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE570 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD87 11088 bytes
SHA-256: f00eabdbbe2bd2ab0ec4d153bbd4d16600ac3e4c6e7d3c2bef26598fafdf7c75
font_02_sfnt_off0001173b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173B 17320 bytes
SHA-256: 50b3b95eb74618de4f1bbdca57d96c06d47cf63d19557b5c229a5d19cdcbd5f8

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