Malicious PDF — malware analysis report

Static analysis result for SHA-256 c74692d60359614e…

MALICIOUS

PDF

77.8 KB Created: 2021-09-01 12:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fc5b4270c0b48c7e95960b89f34cb8cc SHA-1: 6d7e6de54d01b228aabf47bbc91f3d82c0c20da9 SHA-256: c74692d60359614ec447d7f461f4684a5726f93deedafd15c3294b7b2ab6c3dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories and disposable hosting. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it is designed to redirect users to malicious or phishing content, likely initiated via a spearphishing attachment.

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 https://aletihad-group.com/userfiles/files/jazetunipuvogiwor.pdf In PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/1a95a7a1645337551163f449bf5ade15/68215604359.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc9c47beaf---debibedagez.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/22649791908.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/rugametevolix.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608de1f10ee68---21366661316.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/fotumuzasikumureferepepit.pdfIn PDF document text
    • http://teplospectr.ru/images/files/valuperozigiwi.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160909209ba76d---34424910393.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/75217ea0b122f3e878a3ed1c14d6bbdc/tamafapewudivibejodi.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/22206611627.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/45676986253.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/43315027835.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/45004787008.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/sjbedp99n3sh3uuf5jqrucemlo/dugujitolegiteruvuta.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/98352331444.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/49400663995.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986f33f317c---sesoroborefejat.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/d09ced3b47604598b7aef5040a5c18a6/rejaba.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/soxabebipu.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/vuxiwe.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/79863030362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+social+network+2PDF 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_off0000cced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE504 10588 bytes
SHA-256: 472a0f9e4a59f3b187e82abfafc3c0b36ea23ff0b8684332ace79a474f97c392
font_02_sfnt_off0000fd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD48 17308 bytes
SHA-256: 0036bdcd725059184e8e337239dde245f1594cc743ed7f6db98c248334214265

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