Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7096ba4a4921b10…

MALICIOUS

PDF

96.5 KB Created: 2021-07-22 13:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69dc0cf797bc748b5822d3cf34aa7811 SHA-1: e47a70cb30e7995283dbb063e5b1ff897598394a SHA-256: c7096ba4a4921b10c76476f322a37d3a19c8d94c58619a0ba3d771b875c5a477
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories 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 through these links. No scripts were extracted, but the PDF structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://esz.jp/img/editor/files/tesikazoduxevipi.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/b4lnusa9igdvgg8144qq79qe6c/sugivaxiguginawogodajer.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/rbt4gk1v68i3mfjnppvdoag8gu/tovonozetetagudi.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b10a67f7a---laloku.pdf
    • http://yejida.com/userfiles/file/4571183242.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/812cb5c771a5534a02c01cdfae040d28/70295635629.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/d39kea9dpt4107ve8c5cb8hr47/6182667748.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/fc11e015aa4a44e43d4e62f69840b48b/xabefunepafuja.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f351ec8e551---63685919443.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6eb4fe37138b95050e1cf2337173f1e1/15535073804.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/89337582310.pdf
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76100647360.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f09b67fad---65052964158.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/297ef98ec2f7abca3db6824f8e5f00ef/baxotisavofedeno.pdf
    • https://festival.bg/fckeditorfiles/file/53655429684.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/ggp7s0bnnjj8qshp4kr0sh0s01/88674568981.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e8ba9c805---kuzigizoxuwogunatera.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da30d09ad44---turefogov.pdf
    • https://kimtuong.vn/isc/public/files/fckupload/file/87951600947.pdf
    • https://miaousland.fr/ckfinder/userfiles/files/65345186634.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a799465ed---vojirigelozusizo.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b318e41d4---43299230853.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b99d55273fb---lopuku.pdf
    • https://digicpictures.com/downloads/jobikava.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ion+exchange+bed
    • http://s292376414.onlinehome.fr/datas/imgmail/file/mofikozaxe.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_off00011028.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11028 16792 bytes
font_01_sfnt_off0001283a.bin
8cbd004725ef0353010b2de6d1fb77af366e121a0a920aaf167be32982ff14ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x1283A 19844 bytes
font_02_sfnt_off00015b49.bin
9095fe9c0bebf3d192cb99dc7b5229c27438b330bf7f8cf1e60199dad94f2079
pdf-font-stream PDF embedded font (sfnt) at offset 0x15B49 10336 bytes