Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a19e56c09f2e7f7…

MALICIOUS

PDF

62.5 KB Created: 2021-09-02 03:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 23258eb6047cfaf044249367023424a3 SHA-1: 1795461402b4868171199fffa9bf3a83cd5e4a43 SHA-256: 7a19e56c09f2e7f7ad0958bbf3545dd44a1ad1222cd3de425920f846974950ab
154 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The embedded URLs, while numerous, do not appear to be directly executable but serve as lures to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7240

Heuristics 5

  • 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
  • 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://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161044e9eeca6b---96741439413.pdf In PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16077238a25edf---sebikirezef.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/kunoloxuduzulepuzugape.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/06/17/file/20210617_095826_166.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/jobufarunadug.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/xiramamugi.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/c9spm9q3uk73juaevbhj94qjm7/wofamopik.pdfIn PDF document text
    • http://vaikevai.com/ckfinder/userfiles/files/62011485113.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/niqqnj1qlfhrkndh8kiuqmotu7/zewufev.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/6f1d2f743f90aadc990c4590c9de962d/wubake.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f69e8cf9b1---sexekeleturazonelirul.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd642979987---nefogapomosurevabozonu.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/9fd55fab632e81ceb89bd6a758172346/80347323887.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/33c53e98de53b008316b28132b77e5df/21036528372.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d44ff412a09---kitajamowevesejalopu.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/44401858265.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/35e13708c3a9184f9ea1ba673cb3c3ab/51164791700.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/58482845915.pdfIn PDF document text
    • https://bor-diing.com/upload/files/38926587663.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/13704329957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=what+does+it+mean+to+be+wittyPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB07A 10700 bytes
SHA-256: 958396127e06aaf76d02b533143a08aea5ff8a029f034126981f4a1817bb0f38
font_01_sfnt_off0000c8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EB 14308 bytes
SHA-256: 8379b8da0b49749dcc1017dbff4de646fe46e3be6fe21fb528158a8cb9974592

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