Malicious PDF — malware analysis report

Static analysis result for SHA-256 c46b65b89d471f93…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 20:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a48b3c1766b05cef085480e0500f73a7 SHA-1: a19d761eac738d080bfbded921bac1a8a59c568f SHA-256: c46b65b89d471f93072765e693b6b7b20c9bb9991034366eb7bca7e6439a5702
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the heuristic firings and URL analysis confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://garglob.ru/uplcv?utm_term=in+my+stalker+premium+mod+apk PDF link annotation
    • http://apismorava.eu/docs/96892570250.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/kudivulokozuxuretab.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/visifuwijimawi.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/60870747870.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/jofavokijeva.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161447664ab1fc---nibarotujuvanak.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16132a07f102ed---lukexuzixekim.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/35859085337.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/kepalexivufedajavozemita.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/4082725614.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139fd796f652---pasamofiviwikij.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/36259081854.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/rawusopopunejo.pdfIn PDF document text
    • http://minerva-collection.net/files/files/91000454650.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/wajokumases.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/rogibapijuledab.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/dukagisunoj.pdfIn PDF document text
    • http://velo.hu/UserFiles/file/xiluxarezol.pdfIn PDF document text
    • https://pokereshop.cz/data/file/juwijemipumumofewig.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/29278586909.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/73558008046.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/sababokuvif.pdfIn PDF document text
    • https://energooptima.hu/upload/File/bosufupaj.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/nemokirapoderesa.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/warusikosebebip.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_off0000dd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD18 10812 bytes
SHA-256: c395ffb530e8fd96e0d49ef7e13c8767d5b1f8cbdc4378fba2b324094520f985
font_01_sfnt_off0000f5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F5 16800 bytes
SHA-256: 198dc15bd9706a061591929551fcad349302b074b50113a6e18d6ee2d8a3f1d2
font_02_sfnt_off00012173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12173 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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