Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd06dd9b9763f4a0…

MALICIOUS

PDF

75.1 KB Created: 2021-07-03 14:37:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19ffcfb8f4dacc1cedfa46cdbbc7e06b SHA-1: ecaf35482c4ef7e6bd206d722068a7adff2c8220 SHA-256: cd06dd9b9763f4a0598d95f6cd84da8ac18e1341f6aa4ab1a18d552484771fe2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://huntic.ru/uplcv?utm_term=inferolateral+st+changes
    • http://stromzeleny.cz/file/pexototavovowunipizana.pdf
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/54891243406.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/d42a7da38402b25a7c11877a905534b2/30306900901.pdf
    • https://kaptenhoki.info/contents//files/gemabizexasid.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/8ee3b6bbfaffc7f7cfb418227c1134e3/xakusizuzikafizi.pdf
    • http://chiengthai.com/file_media/file_image/file/zelogafajuxora.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb882eba0aa---47249276620.pdf
    • http://akademia-jedenastka.pl/zdjecia/fck/file/nilinajekigoka.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/vvq1sinhnk992f58i9vaus6rhd/xiwamobobalinabejivogimad.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/6aa243dc76defb43cc0ab61e9d5eda74/fuvuxuluxuwibiriv.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bd571fad2---94019710621.pdf
    • http://giasuthanhdat.vn/Images_upload/files/kovexi.pdf
    • http://polskienarty.pl/data/aktualnosci_imgs/file/xokonedumosu.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16094b34511bee---disarafalat.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/7ruiil8sse8tctv04k1hju0lui/likugevovav.pdf
    • http://gintaras.cz/userfiles/file/zelifabugimagusixudo.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/7576dfc1349e4d599cc6dd3d171edf4a/wulijofumagiw.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/1mvjk5lskdf7j3tgodc553vcgg/mufukotirigarilaxixetiveg.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/iqdi742381845qv4k96gv0fvkp/57145333979.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3507070247---81759839690.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a40fc02e40e---68134744480.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_off0000c3e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E5 16792 bytes
font_01_sfnt_off0000dbf7.bin
047dd3722c8a1d36296f30b9c63e94810f59bf84fe3e495a296ad42f436545f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF7 16888 bytes
font_02_sfnt_off000107a6.bin
0cf8569520014051a89a3999848afe5541262e6ec50e253dc016813f7cca306d
pdf-font-stream PDF embedded font (sfnt) at offset 0x107A6 10472 bytes