Malicious PDF — malware analysis report

Static analysis result for SHA-256 850f58feef240dcb…

MALICIOUS

PDF

89.4 KB Created: 2021-06-28 19:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a48ae8cae5da257b9320bea91cb5be31 SHA-1: c1513c41945dd16bda3198fb6f5f5f358e399509 SHA-256: 850f58feef240dcb254e247eaf47ba5a01841286005ed9e32642300298e85f05
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 links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting it functions as a link farm. The embedded URLs are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cukiernia-waltar.pl/qcms/userfiles/file/90716114169.pdf
    • http://appletechsolutions.com/userfiles/file/56626420652.pdf
    • http://banlinhkienlaptop.com/userfiles/file/13206479594.pdf
    • http://matstravel.ru/userfiles/file/vozuripoxuzukiruk.pdf
    • https://sunarchegypt.com/userfiles/file/13404631764.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a732d26f251---55888095951.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/oqf6qi2l9pp25gjpjm76503qfk/49235007589.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cce7fe345d---panebofometiraruzaji.pdf
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/00ac9afb8535821d6e20486ab90c0b29/pekunewid.pdf
    • https://samarpanbharat.org/trila/userfiles/file/mawomuxibomizi.pdf
    • https://walnutcreekguide.com/wysiwygfiles/file/19008402464.pdf
    • http://www.knickmeier.net/images/pageimg/file/66572594395.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/cf7211fb4dba826e4f07a536ceaa6d24/burimokakisomulexobaruko.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/ea23fa9f6bce93dc6e170c533b8651cb/59215758108.pdf
    • https://www.myosiaffiliate.com/199trust/img/file/miwufaze.pdf
    • http://ahcxdq.com/uploads/file/030519456943.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/18c852c501be05c7de28e215a3dc6bcb/disuzox.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ee803a374---fonokab.pdf
    • https://machinex-machines.com/UserFiles/File/pexigamimelibi.pdf
    • http://evola.it/userfiles/files/zodugebodu.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8476fafcb7---35871892.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608219f0c30ad---96342064819.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d72fd0cc281---nogegodon.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4226660ed0---raxepipu.pdf
    • http://ofipapel.org//ckfinder/userfiles/files/xunideniko.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=snapchat+filter+that+makes+you+look+like+a+man
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f759.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF759 16792 bytes
font_01_sfnt_off00010f6b.bin
1c7062775a2584b1547299595ea810d57b1a3a763a5a2e3f9d25901d0a0340d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6B 17880 bytes
font_02_sfnt_off00013e3e.bin
678e3865425f204bf1daee9c539f82cb1f67dfec70f306dfac8cb069e20782c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E3E 11128 bytes