Malicious PDF — malware analysis report

Static analysis result for SHA-256 29ec99f41e38f93f…

MALICIOUS

PDF

79.9 KB Created: 2021-07-06 08:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 466cf35a326897cd42aaf2c0aeb1ad09 SHA-1: 520d8f55a705b790ef6739fb4188b11b1392a35a SHA-256: 29ec99f41e38f93f85e5ab6647d2d2f0f1cf5c96a7853a96fb178f5261433e2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect the user to malicious content.

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://amirep.com/wp-content/plugins/super-forms/uploads/php/files/e22b302ad316a2f67d381d873b2c2e19/90234949176.pdf In PDF document text
    • http://guanzhuli.com/userfiles/file/56552948217.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0a52ddef75---mososegonebodejobas.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/5ac4826c9cec88d465661bc46946ea26.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/4678831073.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f49ec1d5fd---lulivevifa.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/gazikalifesuposesipam.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/zuvike.pdfIn PDF document text
    • http://gewald.ru/content/Files/fawedunanojaxi.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/4830368b8fd359f2d4600106807dfef2/30795161828.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/5c02b5cbd9423bc9beb087e6fd1fa14c/43206347250.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/hl79lrv608gfk7utj1neud7511/medikuruvitubujuxajoxopo.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1607fab48a0185---xexuvuno.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210703144623.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/lopibakudireguvefevobok.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ab53ffa08ea---42613770819.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/cphsh5h649o3huth80la2ncog6/39843003955.pdfIn PDF document text
    • https://autoparkalbanese.it/file/jivodunafijasuze.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbda4e8dff---3973393458.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/pefokoxajemoritavazapeb.pdfIn PDF document text
    • http://sukhabalka.com/files/file/57462847782.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/25ga0jbkier5kv5ujr3b33gih3/dosiwavexadi.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607df9cbc68d3---busal.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/owovakapobuxuxojum.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a01c84b49---99812043488.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=not+dissolve+in+waterPDF 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_off0000d6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CB 10368 bytes
SHA-256: 417bb877898bf18774c56bd11dfce30405fff248158904b5968161119afb1bc8
font_01_sfnt_off0000ee67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE67 16908 bytes
SHA-256: c1828bce9e0f48589b8d4c411f44a8948302c3b81536ee5259be8b4f340e75f0
font_02_sfnt_off00011a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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