Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a6b4e21f8c7855…

MALICIOUS

PDF

87.6 KB Created: 2021-07-09 22:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03aa25064492081089f3ae400ba0d04c SHA-1: c6e23486e59ab9381245fb232b1ba92df7ce58c7 SHA-256: 05a6b4e21f8c7855e6039cf1025171061776134bfca31e47fbc9fb8c93e90d43
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress upload storage and other disposable hosting sites. These links are likely intended to redirect users to phishing pages or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://ajwatravel.com/wheelmarine/userfiles/file/62561309307.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16099d07483183---98192130641.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/03eb803570be038c022a53866a7eada4/25201332517.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b9ad26bf8---putuborejakagefosaxid.pdf
    • http://alimentosldm.com/userfiles/file/mokonenigowufedebad.pdf
    • http://vienhung.com/webroot/img/files/fujurewixobobedelubepo.pdf
    • http://lumieretvie.com/userfiles/file/64189318184.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/da605c1ef57137f50e3ecfe4da3998d1/ripasosijoxik.pdf
    • https://wisserarm.nl/app/webroot/files/userfiles/files/19455290928.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85f0bbd122---nedofo.pdf
    • http://lube-stc.com/ckfinder/userfiles/files/jubilejemubobarow.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/53994726865.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/7n0j2k5meecek95p3g1o4ttus7/nuroxumupitosisipin.pdf
    • https://cakenepal.com/userfiles/file/xejajuzuvotobojafalesu.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f685e6714b---lupuwowavojabuxox.pdf
    • http://short-story.ru/upload/file/gifurunibegipagav.pdf
    • http://morgancountyoh.com/userimages/32413317086.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609282ce46d6f---vezepokinege.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c89f49ea829---dugemosizomimuwusewake.pdf
    • http://francescofesta.it/userfiles/files/64430215402.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/cd5e0f35d8ee5047474d046561b7b859/kesumijakuwudibiboju.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=kidney+stones+in+dogs
    • 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_off0000f6bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BB 16792 bytes
font_01_sfnt_off00010ed2.bin
2cdc5f59d4d817fde336ea6828a870ed3a3ad0de2ae9a78a83bfe423721133e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED2 10220 bytes
font_02_sfnt_off000125a9.bin
2348e33cb3eb05fdd69800d1991d16e844cde1c7e62733c2f3e26f49279f2498
pdf-font-stream PDF embedded font (sfnt) at offset 0x125A9 16780 bytes