Malicious PDF — malware analysis report

Static analysis result for SHA-256 36664a92b3007c53…

MALICIOUS

PDF

93.7 KB Created: 2021-07-06 23:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c0235301ed158ba3e04dc690f7b942d SHA-1: 8d961a2d8a110d4e772713cd6627fcc83c932ca9 SHA-256: 36664a92b3007c537028cd6ebd6f448eedaaa566a48725b1fea066b3c7eb6516
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://infrive.ru/uplcv?utm_term=stranger+things+drive+into
    • http://sunnysidehigh65.com/clients/d/d0/d00d1ad1640c45b888f5e58ac216a5d1/File/59247926283.pdf
    • http://157.230.241.115/image/upload/File/nexazegizofigasaju.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecade57f24---xunaribetafetomik.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/l8cqejgcr0rvpdur1clp3h0qh8/nubuvagivirip.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/dikepiwimosi.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/cc4e1e46e31edd8d2285d87323738744/37421998516.pdf
    • https://ddshower.com/ckfinder/userfiles/files/51604153910.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608296f5ced72---12454495028.pdf
    • http://partnerplus30.ru/images/fornews/files/zokanok.pdf
    • https://briljant-maleri.se/UserFiles/files/rebedokemoravurin.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160731bc81c239---vufemefijunijob.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/stng0apbh9pjq66j6hemqorv5r/6585881672.pdf
    • http://gintaras.cz/userfiles/file/4067094763.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f9bcac46f---nojaja.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16086474ed1ee2---84340979174.pdf
    • http://buddhavehicle.com/userfiles/file/wukadoxoz.pdf
    • http://ghinelliarchitettura.it/userfiles/files/18387780158.pdf
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/mexuwaz.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/44d59e1c03f98eaea439f3ce5527a363/889033470.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/6giio8vuv8kumpmddnfq2jehgt/7495191756.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb70b40a3d---jonekivemonikavikarip.pdf
    • http://mobilni-kadernictvi.cz/files/file/dokapodu.pdf
    • https://autosaloncenter.com/uploads/files/nidivi.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/b4d7ecb2df1be586cf0e7d1e7e71ec8f/mivuwedev.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/e1de798f813b4f3aef84cbe07b57c032/vakagimujebujadetuwugika.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_off00010bd8.bin
64b47d59abd2214cd6c38b94c5cd7998e50100a36485cc10a124733671e21646
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD8 17400 bytes
font_01_sfnt_off00013944.bin
b9fa576bffb77c0832fb1007f051d7439abe05155b6ffc4e24a0d8399c2e2ec7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13944 10620 bytes
font_02_sfnt_off00015147.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15147 16792 bytes