Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e4b6ff7a3916c3…

MALICIOUS

PDF

92.1 KB Created: 2021-07-17 14:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d5bbffbc6542221d29fc47efa0dd37a SHA-1: 145c66b5d0e2056c2360a4da55b1b3c571c8ac40 SHA-256: 72e4b6ff7a3916c3a3445f942093f0ea9ed59f88a57149ec2843d7c58de2b201
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://jagatjyotischool.org/jagatjyotischool/userfiles/file/jizikumat.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/c4575f84d998bde253d6848d4fe86358/kexirotomufobi.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e7b505349---42870791810.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160808ed48c3f1---jilumepikupu.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/fv8vhegu2kgpduvmlmpp7f6tg5/karafufisasijal.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/f22fe1ddd50f38f8c1b9053e0a49e82f/jasetixazuxaborel.pdf
    • http://c2r-auto.com/uploadfiles/file/2021051922005073499.pdf
    • http://openendrep.com/userfiles/files/tudosibupazejix.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7opa6pdjhh00r68kjjj5akci25/16284781000.pdf
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/80420538050.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078a89b85f4d---13178390041.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/8201h22h9j2118vqhajk0rlqu1/zubujawupigofozovafuloful.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/69627534649.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcdbc7d1a4---birekanafiperemuk.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/pts9pjo36lv6dgb3nqdgg1um8v/lesapifimekibuvusapabodan.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071eb46c8647---12540772778.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/08c940c74dd0f249094d1a6236275d97/bagebusamasetalekux.pdf
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/93323431062.pdf
    • https://resonanceacteurs.nl/userfiles/file/jinikofetekuriwamawoturu.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f0a0c7525c7---70950659267.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/fb8a63a38929c32014af8baa62298377/36454840420.pdf
    • http://brandnewgoods.net/userfiles/file/bapekogenijovug.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606dd79d02031---96213350671.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160774feb63882---pebumevobibotutila.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=what+is+the+primary+function+of+a+flower
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee2f.bin
bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2F 16252 bytes
font_01_sfnt_off00010410.bin
4b42c74406a4baaf7b4c348a74d98c8b9f9a96cc45b09a4403fa873e49bc9b3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10410 11040 bytes
font_02_sfnt_off00011da5.bin
8332e2f64f52213ec1fefda57e62b10c52caf7c891e6380ac5a1b7afba8e38cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA5 17032 bytes
font_03_sfnt_off00014a2e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A2E 16792 bytes