Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ce74160d2c50961…

MALICIOUS

PDF

78.1 KB Created: 2021-09-06 07:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b105ebf35641134b71d87e75574c6ddc SHA-1: b0ee8af23fe02a85b26cddcccb92960c3d94355c SHA-256: 2ce74160d2c509617c7a922a3e574fca336b5b95f37fc510c71834f031b7301d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to download and execute further malicious payloads. The heuristics indicate it is part of a link farm hosted on compromised websites, likely to disguise malicious downloads as legitimate files. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=demonstrative+pronoun+worksheets+for+grade+2+pdf PDF link annotation
    • https://horgaszvelem.hu/ckfinder/userfiles/files/50158725629.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/rejubunavilevaxidebi.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9b6602cb9c---95122324642.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/nulufufesonaxosupexobitaj.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160717f73ab58f---nutewe.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/pipoxelagikomuxanamasuko.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b1856769fb3---31888820571.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/ledesobibozexi.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/p264phfagkg4ti1to630rg4sjc/tutefezamanarira.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16269516540615.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160eca0d97e86c---11047150500.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/7394142754.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/7be91bdc8914b599bffadccd38a3fc56/32237095208.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/zobogosuli.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/molunizav.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/46576369807.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/musaruxo.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/49890671758.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/katakexaxoja.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/turovivaderut.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/tudajatinabimebazu.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_off0000c838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC838 18288 bytes
SHA-256: 853ca2118b58287034b6b02faab3a9f408eedfc16f8bdd7f3ab6e1a85815385b
font_01_sfnt_off0000f7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBE 11364 bytes
SHA-256: 272b418d957537bc71a103ccd210cd16fe15ea2caecf2b801188360e28fcb9e5

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