Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0c61f403df700af…

MALICIOUS

PDF

108.3 KB Created: 2021-07-03 03:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32c49226c10a0389df3646b50ed10569 SHA-1: 141e190d0d185d1a0c16cb887bfe9b449726b1d8 SHA-256: e0c61f403df700af656f96174b96b5c90a357b248541b7a700232ac48890a71d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm hosted on compromised WordPress sites. The PDF contains numerous URLs pointing to various domains, many of which are likely compromised or disposable, suggesting an attempt to distribute malicious content or redirect users to phishing sites. No scripts were extracted, but the presence of embedded URLs and the link farm structure strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/da0bf5e7d1c472e65e09ae4c1bb7179c/76421198737.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfd425e490---73233158363.pdf
    • https://rugsinc.in/UserFiles/files/67759213806.pdf
    • http://graphicyazd.com/ckfinder/userfiles/files/zorezapajipoj.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/8399jlm6h4uj17lq5t6f0gdg64/fabegopusulogafenoxikux.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085b0ee8907a---mopinepadalubegijod.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb8dc24fe4---80643442994.pdf
    • http://fashioneducation.ru/userfiles/file/42242474883.pdf
    • https://coonvalleycc.com/userfiles/file/lamobajuzodur.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/13v82940m8a562f6vkjf4onagb/59187902218.pdf
    • http://studiolegalezullo.eu/userfiles/files/90026416743.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/be89df159eec7bb625987b8d3cfdeb4b/mugekokigufa.pdf
    • http://stevis.cz/files/file/pukozufo.pdf
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/titoboxunivaw.pdf
    • http://armanetti.com/images/31412185439.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca9a457cfa---38083361548.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c22e021d67---sigizake.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f7e4f2f460b7a25dddf3312d094ef2f5/kuramarujawatak.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d860907974f---19744950131.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16082ca200b205---7980072977.pdf
    • https://fiberglasssupplydepot.com/userfiles/file/55486417679.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/81624e6a45b03178568d6bfd4c259eaa/nuzod.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b9c65f1d6---befotuzexefizetepugowivi.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160701bc81d120---rolupumomegadujasinekuj.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/5c6cjt4gk6v6qm9dcbbgl72t0b/jerizovafuk.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=yourself+in+malay
    • 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_off000143f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x143F4 16792 bytes
font_01_sfnt_off00015c0b.bin
f8e37eea05842e7ab6adbd38f28fe03f136efe0d45c455577fb108dff213fb7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x15C0B 10472 bytes
font_02_sfnt_off000173ca.bin
9e3c9b5544613977511b9226d30378c104d376c76287ec64176d1d87dc6bcfea
pdf-font-stream PDF embedded font (sfnt) at offset 0x173CA 19300 bytes