Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ce8ca8deba028a7…

MALICIOUS

PDF

83.4 KB Created: 2021-08-12 23:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ad41fbb4d00e775b33efb0a7f88a89a6 SHA-1: 31a71cef355bf5e9fa1a68559582c9699c7588f9 SHA-256: 6ce8ca8deba028a7d660e3e98f9ebdec2c6777f5419fea6001f49c3d3a581551
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous URLs pointing to disposable hosting and compromised CMS upload directories. The PDF document's structure and embedded URLs suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the presence of multiple external links indicates a high likelihood of redirection to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3734

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://coretry.ru/uplcv?utm_term=tia+portal+v15+manual+pdf PDF link annotation
    • http://foodchemsino.com/d/files/94779411177.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/4b8bee6716d5ec60638187661fe45546/34883727503.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/90969352980.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/21419928896.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/paxemaxofufelitubewodexo.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/zepirarewubav.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/balafuginif.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/xamemulipelivadivud.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/99166341960.pdfIn PDF document text
    • http://salt17.com/userfiles/files/pamuwowodawemubiroxa.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160887616bb382---bunovusakesagul.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/24057362629.pdfIn PDF document text
    • http://euro-ex.com/pafusiruwafutaxedezefa.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/vru2i9c4lvfv0ask1op6uqoo7u/70762110938.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/04159fcbfd805f3606e45876b2d9ef0a/noniketamusunalifowuwur.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f30bde56ef---30248794179.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/5049052626.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/berev.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2420a30d91---76006267560.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/20960456599.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/e8c681b8631d25b34ac81bb8125c9cf7/88357235643.pdfIn PDF document text
    • http://beta-rc.com/upload/files/99669564948.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/sozorifuje.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/ba215190b3a25649c1ec11298422809c/fugekijilixu.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/2otgo145elenuku350svmafn44/17268190011.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/lixole.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b92cae87f53---61234177437.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_off0000ee1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001062f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062F 18900 bytes
SHA-256: 6c5331e5d4fc8ae2cf9e243602ab5a2d63ab2b607fe82b7df1b14cce551a671b
font_02_sfnt_off000135e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E2 10676 bytes
SHA-256: d7cec0ff372b35de6844c6051e44c40ef6dd4361767fb969649c602bf7c3fb40

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