Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc85290675b23d18…

MALICIOUS

PDF

79.6 KB Created: 2021-08-31 06:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 88d7f103e2fa13f9233dbfdddcf7c80f SHA-1: d0ff7e68d669943d74097ffd12e3b6678cb0553a SHA-256: fc85290675b23d188cfa9c0d6dbc84c646beb29b802e29f931f7d21c88add737
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/8811639864.pdf In PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/bexusovupezet.pdfIn PDF document text
    • https://ptogel2.com/contents/files/18989880759.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/lufanisumopubotamutitobes.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd1176a82d---54008452473.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160856da540181---gixepelit.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/26131246389.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abfc089e860---nisizekodelunosid.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ed2bc4020---87612516144.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/jujokavo.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/xunifomunone.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/miliwipafoduzafefozitudog.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/517603bc2d712e642872c6e25e813757/jojolenilupisa.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/65984106440.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/83331576326.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/29535427750.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/wazotewamot.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de675116631---99363851381.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/wafegifilalijavexudaloxi.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/kovevibaguv.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/wajegevoliwu.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/66318231896.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/75129824598.pdfIn PDF document text
    • http://abc-tel.ru/data/File/18599330228.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/f529d7e59c34dee0d99b49b769242a90/nufavubefoka.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/608a4d6321773bed4dc67a71245c6b58/49507048350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=meaning+of+severe+in+englishPDF 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_off0000cb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB08 10452 bytes
SHA-256: a0628f3e60de1ef3cc710579526e6dcd446e16f265dee3a8be47cd7dabae112e
font_01_sfnt_off0000e2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B0 20736 bytes
SHA-256: 778b8c18d362a102cc098462500238ba04a3aea897cde440be765f6649f045dd
font_02_sfnt_off00011911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11911 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1