Malicious PDF — malware analysis report

Static analysis result for SHA-256 938f5fcdaa757707…

MALICIOUS

PDF

86.3 KB Created: 2021-08-25 13:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 3181c6351ac4fe162c87033b992b7f35 SHA-1: 04b9d3019b6bb85220d261eb0a96abba7597c410 SHA-256: 938f5fcdaa757707e0def47213d043a1c5e4ec7ea7390401b3ef99dd906a2fa2
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 an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or scam campaign. The primary function appears to be redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 https://laborke.ru/uplcv?utm_term=word+for+analysis PDF link annotation
    • http://sluchatka-shop.cz/files/upload/files/jugaxuluge.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091d6e205841---62491942536.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/m6hqi1jhf92gaifroitodrn8qa/biduruwezatokenelesirupes.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///50174232482.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a952e0de02b---27644336463.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/faxonomeg.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a688e20e0f---sipelumaxawivef.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607792911c4d3---9308657010.pdfIn PDF document text
    • https://kopari.hu/files/file/69471273732.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/pekajefebezolipojexonobe.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/gowazediledimit.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/89494524424.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/6825c7dedd57fe89a4f7ded6002fff3b/nuwoditejafawirobojerevaj.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/totimuradipetakexatasode.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16092ddb0da18d---fomunulagitapi.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd2833daaf---44753950868.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/sipisubewetatotesamero.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/xidewixufenadod.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087fd06f2c78---vowisatojakufekanejavoji.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/lonem.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/dujepebemazu.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/bozudaveku.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161200900eb030---80582970771.pdfIn PDF document text
    • https://kopari.hu/files/file/warogovazapawixur.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a24edc7ffff---74984972197.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/40465054441.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_off0000ed82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED82 17556 bytes
SHA-256: c071643a84887d2959eebaf6b7891b26942a4b5c545d8ae8b1639b47451d644c
font_01_sfnt_off00011b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B66 10224 bytes
SHA-256: 2064059d5c7381ce35148f88da3e2654772d5563a842f574b10d6687bf6d7f90
font_02_sfnt_off00013266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13266 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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