Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9f446ac8bbdc5a…

MALICIOUS

PDF

73.4 KB Created: 2021-09-09 04:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e359eb979c3b5aac0e56ae94fa3636fd SHA-1: ef46b43133a1a31a4399a4385aefdb9bb6e27d46 SHA-256: cf9f446ac8bbdc5acb0bc0b340b46b8adc52434ca02b1b18e7cfa408f1326f85
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external URIs, many of which point to compromised WordPress uploads or disposable hosting domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristic findings suggest the PDF's primary function is to serve as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6691

Heuristics 5

  • 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
  • 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://ketchas.ru/uplcv?utm_term=sync+bookings+with+outlook+calendar PDF link annotation
    • https://www.eos.org.eg/ckfinder/userfiles/files/36953150876.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/54635236855.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/surubadobabo.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/m0r2sjs7i9c03oecf7i2k629j8/rufafuwusuzovifez.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/52337097021.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/nedozu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ed9ba06bca7b377b42f9043e52cb2d4d/vomuliresuxakojaz.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/lupopuluse.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/vejitepir.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090400413556.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/99725889937.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/24240447659.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/vegak.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/sejujadi.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/texavixasoxelutasimi.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/likudexoxiwonelopiximus.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/lavodinini.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/19704517639.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/32745329363.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210909073828_6496241.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/kfln6eb32evk09v5fpu332h8vb/luzeg.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/0da4bbc9094372ae9afaa79b81e6e746/76299909267.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/tekaluderubajoxu.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3A 18412 bytes
SHA-256: 7ec5fd2d2017435bca6f345b483275567873dc313b1d8ee5f4cd7245e9b1f82a

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