Malicious PDF — malware analysis report

Static analysis result for SHA-256 85af2472c17bb0bf…

MALICIOUS

PDF

140.9 KB Created: 2021-07-04 12:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2e5e8223276a84e5c7f0345a3d08a238 SHA-1: 5d703bc86c50d775c4f11d9489b5885af1cfdcbd SHA-256: 85af2472c17bb0bfd8773c67f6726f0a2a36b128c23a8ca372cb3716bd7a39c7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress installations or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but likely serving as a container for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pixomot.ru/uplcv?utm_term=kilocalories+in+carbohydrates PDF link annotation
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/c1cbb50c21aeec1c45f5e00652613472/64760141671.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160862a8f3fa27---sigewisaganev.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16082a9e37bf43---86010357213.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add45d9cdbf---90339651955.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/37683359817.pdfIn PDF document text
    • https://webmenuplus.com/images/file/96323958796.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/16e945ccfbeafa8817febda65aee4f96/ruxeteganefipigonasesa.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160856a7adc72d---99418575589.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/39f93ea9215dd747d2ad256694d838a4/gididetatanilito.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/52628695485.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607630f4dcfc6---vapekabazetosegikipoku.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/5f6d3b4e159096ec1ee0c0890fcf9db8/73653706383.pdfIn PDF document text
    • https://csodamalom.hu/files/files/wegozu.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/57414631525.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/d1f4b287a315552640e804d9d2103342/tugaluxavoxijegatoziro.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/watutopoxud.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/mirokovuzamagavelamudibas.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/c0a62487b05e657cef617247db65ca83/65949257036.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/36528232578.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/98741236144.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/7mtahvco5ql41n4sdmrg5c4fo1/20728412969.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_off0001c463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C463 18672 bytes
SHA-256: dd5b9cb9ccf3540fb4d5132c7b06d1d6674415356c6eb685df1f32095f184b06
font_01_sfnt_off0001f5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F5BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00020dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20DD5 10712 bytes
SHA-256: 34f2bf64d8b02726235174c6fc4bd3e4dceb17aa65ea057132b052c1753bafc7

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