Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ea04b79e9c5ce8…

MALICIOUS

PDF

92.5 KB Created: 2021-08-05 03:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a44ad7f5639cf0aa79b7d5e185307530 SHA-1: 3cad554d47e70a6c7e3f10b133d79879ad6df91f SHA-256: 10ea04b79e9c5ce8bc1fc4c20ea943bd47bde1bfa1ad7345371026a571c1183a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9529

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://catamma.ru/uplcv?utm_term=consulting+services+business+plan+pdf PDF link annotation
    • http://onsijsselstein.nl/userfiles/files/mosodizol.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f565695a40---53061846163.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/giliwisifevaxiwiji.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/646b688c77d678c61667a0e016f2ef7f/tutujinakevolami.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/sakilakufejujusafusujun.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/55182372426.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/fenijizebi.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/90605295576.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608470ae88f12---8685847386.pdfIn PDF document text
    • https://bbdirect.com/ckfinder/userfiles/files/topadegofideboxugaguxi.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/90588596680.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/u7meul05nul1q44tebkecb68sb/12327864628.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles//files/magesegakobadazizewu.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a36c2a8f5bb---duxumenujex.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/86665576457.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/37900803136.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bowuvij.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/vinegix.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/217jo7iju1ocrkqvfmk2k2n8bf/84311810518.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075280f30f4a---danumurimedevuf.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/6b696e4c6e8386df261d310ccd17ac48/67889341534.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/89df408efa7890dd1041952a8e302ffa/18704283412.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/06a7c80cgtpfth0nl0049fgh34/limafuvevobezirajabamed.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/mibupekalusipupaba.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/98859329378.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3D 11132 bytes
SHA-256: 6f313cc9fa8c88aadb228d3a1bbc3668f6e65369adecfe71a91a33ff5e172115
font_01_sfnt_off00012708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12708 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1A 17568 bytes
SHA-256: 5bfcf5489c1399bbc016e216843dc4cc3bfff95633ace82692052a2ca8fc1af7