Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb6478f868d67be…

MALICIOUS

PDF

84.9 KB Created: 2021-07-24 03:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 944012469faa209bde01ded0684b8f45 SHA-1: 21605690af636a5dacbef97b3421b8be56a89c1e SHA-256: 3cb6478f868d67bea4fe2938ab8e68aebf0945209f8354a53bc34a9cac7d1016
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV and an ML classifier as malicious, with heuristics indicating it functions as a link farm. Several extracted URLs point to compromised WordPress upload directories, suggesting a tactic to host malicious content or phishing lures. The presence of multiple distinct hosts and a 'utm_term' redirector further supports the link farm hypothesis, likely designed to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b97b76e125---rapebizaxudugujawaleko.pdf In PDF document text
    • https://mobilieroccasion.fr/uploads/file/82024084962.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/38llujqnjrm66hg2vgohmqt9r2/72286689543.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/jubesifetajidad.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/fafeka.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/t6okdq9f1prvvffp53s2jjlmku/75344538932.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/jonufutigobodibe.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/pajori.pdfIn PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/tejaxaxiwajaw.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/oj1kbnm1bj5h0a5dpekst8s632/71301465102.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/benanujomapimajow.pdfIn PDF document text
    • http://digifast.cz/userfiles/91682150540.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/vanijewirovofujorib.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa626abdbf---bovidivakilexabuxa.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/76204483174.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e55eedc856---logozenigaxorivovoboz.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/47836839292.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/kagikakawegelab.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/93255604253.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/nozotevewokogelo.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0g7qoe0ctienj7gaf1qidlqib3/70858778796.pdfIn PDF document text
    • http://www.sanruou.com/app/webroot/uploads/files/lewapova.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=despacito+guitar+sheet+music+pdfPDF 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_off0000e775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE775 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8C 11020 bytes
SHA-256: 82c6cc52a9b23547012e9e7fd14c7afb138730c774e89d59a038355de53b0fd6
font_02_sfnt_off0001190c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190C 17144 bytes
SHA-256: 4201fb1c5f11c498ff2bc44207efb1e525ba0cbd1d79a0428b8ddf4e195ef4d4

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