Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bdb3ab00f160612…

MALICIOUS

PDF

77.7 KB Created: 2021-06-29 05:41:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ca5c3cb13208e5ae7750c8a62d2bd72 SHA-1: a7c6aaf965862775c0a704df71d0d833d893a7cf SHA-256: 0bdb3ab00f160612e820593f55940198b400d4a2828df0049a35eb78dc4622ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1071.001 Web Protocols

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are on disposable hosting and likely used for SEO manipulation to host phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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 https://medvor.ru/uplcv?utm_term=compare+bfs+and+dfs
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070100e3574d---23168271506.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/86c197d2c2601c5c66a7907b6298d6f0/waxabulixinali.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3bb19b104---resamepawapoxunudedabovoz.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/bf56e189c1ce5c8fede3bf51c8a5c53a/19798852107.pdf
    • http://kartywspomnien.pl/uploads/assets/file/38258709732.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/fe501db05e98e2de9b8c1b97eb6dfe31/24205943223.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cecbfdc658b---miloxusopuxov.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/784a0c745a2b9975a572a8ab4d6c9f76/widexaludokewajapige.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/ktdqhmminfm15garbkbpr672g6/zubaxekukekugowibilufigi.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52b171506f---94137538731.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/bd6aa84057a6c08cf99a1b9a2f2ff05b/39781393842.pdf
    • http://korsorlampang.net/user_img/files/75609562713.pdf
    • https://zlatartopalovic.rs//files/xizeluwuvoze.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095eab746fd0---66689695774.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/7b21765b2836e1447875268ec682e65f/25201089244.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/5ngqu47q4cgubokhq88glrtg83/55069250747.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/093242cfc9ee56f670872eb7a3e4b164/nedozesigejab.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a76ca686d6---pazokura.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb10a49e52---derazorojozovenujexuji.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d37baec66e3---xemarokebuwezizexoj.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/ahpv1r6etgeilurote7mfovev3/jadawexipaxiwanogu.pdf
    • http://md-servicios.com/userfiles/file/dojivowivajivekorejameg.pdf
    • http://malbreil.com/userfiles/file/vitopula.pdf
    • https://b2cexpressdemo.com/userfiles/file/86312122583.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b42c9b72d06---89489150669.pdf
    • http://princeverma.in/uploads/files/zafozebim.pdf
    • 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_off0000cd89.bin
adf8543816d6de330223ba35b1cdcc50a1f9a8e510470718600bdb1a78255f6d
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD89 16884 bytes
font_01_sfnt_off0000f9c2.bin
b9fd03ffeef46afdb54b0ca7c432ca3b4aca16b8df124b2586ab0aeec19b79cc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C2 10596 bytes
font_02_sfnt_off000111b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111B5 16792 bytes