Malicious PDF — malware analysis report

Static analysis result for SHA-256 9143b2bf3a4ad08c…

MALICIOUS

PDF

72.4 KB Created: 2021-09-27 23:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2415415e76db8705c1a8572c630b7299 SHA-1: 4dd0a8e7f309965dd535b0682e78f5115aad293f SHA-256: 9143b2bf3a4ad08cdcf086fe3c233e394634e8e2adc3fa4ce415954410868508
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to redirect users to potentially malicious content. The PDF structure and embedded URLs are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://garglob.ru/uplcv?utm_term=thesis+on+job+satisfaction+and+employee+performance
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f18f3af3ba---42215570244.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161337c63a6c42---petuvowipatalasidupite.pdf
    • http://mizuho-co.net/file/ck/files/fupuk.pdf
    • https://mavachhaiphong.com/upload/files/85497436522.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161460baae1cb0---49459159223.pdf
    • http://konferencii.org/web/uploads/assets/file/gekipo.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613963246fb22---ditef.pdf
    • http://retco.ge/ckfinder/userfiles/files/jokeguxudiginaju.pdf
    • http://hurtowniagrafit.pl/userfiles/file/52254081370.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/qggsuq6c78evc9r62bb8p51392/dipabazinufipijedipana.pdf
    • http://sity-luxe.ru/userfiles/file/94694553342.pdf
    • https://zniczekowalczyk.com/user_images/file/2181772529.pdf
    • http://abwessex.com/uploads/files/tisazivatemad.pdf
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/22359810992.pdf
    • http://granitemountainranch.net/userimages/85001000395.pdf
    • https://micsys.in/userfiles/file/lifudajuxozuzufoten.pdf
    • http://imbirimbir.ru/files/80819708006.pdf
    • http://linker-apps.com/files/bujiged.pdf
    • https://ferropula.hr/files/zojadabejinitupaw.pdf
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/57208116114.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/mukezexinigaxidixorevuru.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16145a2eaedfdd---napusedemipopuzizosubuj.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_off0000b549.bin
7f8e0e3ec2caee697c664e43b94db5141e1d506c28a56c314695795fbe227a62
pdf-font-stream PDF embedded font (sfnt) at offset 0xB549 16636 bytes
font_01_sfnt_off0000df57.bin
2a4a510369c9d3fa75ee8126df68eb8ab4bd010f5a09b5e7398f725c09c6885f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF57 11232 bytes
font_02_sfnt_off0000f947.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF947 16792 bytes