Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c0ef8ecd1350089…

MALICIOUS

PDF

68.3 KB Created: 2021-09-29 06:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5cc66164f5fa02376c060b1b8d2480bb SHA-1: 367bafa9078a343cbf32491525c89b17f66534a6 SHA-256: 6c0ef8ecd1350089b66134a9d4bfe6f86ee800a38108a99a95b56694de866d1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, suggesting a link farm designed to lure users to malicious content. The PDF structure itself is indicative of a link farm, with multiple links to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://philabc.ru/uplcv?utm_term=best+video+encoder+for+android PDF link annotation
    • http://ayrh.internet-match.com/upload/files/81817617400.pdfIn PDF document text
    • https://bdata.vn/upload/files/vipazi.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/62751622521.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614ef9b851376---41335015256.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/89824873030.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614241409f30c---49656774198.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/92966644054.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/bubutezodabasexag.pdfIn PDF document text
    • https://poker-fire.de/file/kakalepabexut.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614972aaeeb17---dedazelekotiz.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/xaduwivodup.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141684f5d8e3---53265313015.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/80736313053.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/kezanadowa.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/81241230545.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/94483572349.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/52861871342.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/faxoza.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/672196085d1517698ac725e8fbc17fa1/11672312702.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/56380531919.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/neravifitabepezu.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/17277278514.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210916181513.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/27507904367.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_off0000aed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E9 10540 bytes
SHA-256: 2c8553d4ba76c6ab7490c7ae3e7a11e0e9713828ab49c86b5cc5f236b7d3a754
font_02_sfnt_off0000df21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF21 14592 bytes
SHA-256: 5977827229ba3e4d65734390cf065a4d9eb11b8244358cf644c84778e84e8868

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