Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec62f8250621934…

MALICIOUS

PDF

167.0 KB Created: 2021-08-06 22:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 44d1dd70428d2e89b2049e6e26d744d1 SHA-1: 62b9f0401ad4e6cbe94f5d007fa2342bc4bc0d14 SHA-256: 8ec62f8250621934b94d1deb98ebfc39c48d8b117315464198a54484cfd77b7a
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The embedded URLs and the nature of the heuristics indicate an attempt to lead the user to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://vksraja.in/fckeditor/upload/file/13290426827.pdf In PDF document text
    • http://baohanhranghm.com/upload/img/files/87028324044.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3c81e241e---kekosed.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f02149c44---14764360964.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/20100373617.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/b2a41e52fb548c269082793af694991d/15170967466.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae8b16d3bc---96435699597.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/8510b40b397e6f5b6b32475e250d5183/mofagidezivufi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be261686e55---20490259696.pdfIn PDF document text
    • http://sbcnepal.com/images/file/lobemokijav.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/sidix.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610106ef7eac6---divejamofatinuwepidagabud.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/0c67adfb055e1b60a662ba68403d67cd/63545306211.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/0bbd181c238f08ca7e2d1b65dba03baa/99270357879.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e543335bb---fumowewewe.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c872cc5450---jogosajoletetisexemu.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/72640604879.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/1mg2brgitqa7kt4n73eud85rc6/zoniw.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dc1f84171aa---24266885761.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/57372289667.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/f0e515e497d6cd8899a76d2b5dd6bd7b/beraluzufipedodikonozopix.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/vuvodujironiwazuzoregoweg.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/3196c0be16fd259dd0609a3d13738c3e/nibowaberanebuvamoxoned.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=descartes+discourse+on+method+and+meditations+on+first+philosophy+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00022d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22D5F 18000 bytes
SHA-256: 4c11195c343685357121035cc1e4064b168b6da64a6a997e6a0f425821da0e71
font_01_sfnt_off00025b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25B7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00027395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27395 11100 bytes
SHA-256: ded63199f306b21e2c6a4cbc2300668429fada4854df22564abbbbce7b35c1ca

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