Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e194bb9e49c2d87…

MALICIOUS

PDF

64.3 KB Created: 2021-10-02 10:38:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 75a1134923932db1cf08ac25217f61c1 SHA-1: f0dcc7c89f0dff8f0c530b51c534b7c6813766d8 SHA-256: 8e194bb9e49c2d876c4f051874d8e9a048543e8692cae0577b657f32eedd2b8f
154 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains a link farm with numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of external URI heuristics and the compromised CMS upload link farm strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5809

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://chcial.ru/uplcv?utm_term=another+word+for+pleb PDF link annotation
    • http://asckhn.com/acskhn/userfiles/file/98600676671.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/xemomolot.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/sadajezoteretexuwi.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/milaripumunowubalojaduw.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/e608tt1bac97mgtgak9mmms0r4/sakaxonoxarusenabizafuduw.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/d1p121ead0asetuje9etfmo17i/14411889601.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/83624678468.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/rizilinasewivinogunul.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/pavofata.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613448726309a---ketot.pdfIn PDF document text
    • http://gnox.vn/upload/files/favalofozidaxikin.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/sikituzoxegi.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/96562039760.pdfIn PDF document text
    • https://fuoriscena.eu/file/lanubovetemegazumusibaf.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/99363814598.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/9502502474.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/jupinikepabufewapak.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/35939129698.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/bajotemosatudenupesebo.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/popojosirusoxijaburuvov.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/84962716064.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/51089646457.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/2121731793.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aafd25279c---30834081297.pdfIn PDF document text
    • 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_off0000b827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB827 18952 bytes
SHA-256: 5e0ed85383a6f30f8ed584ef088177292eec8edd8865cab504c0ad57a72af7c1
font_01_sfnt_off0000e7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F7 10380 bytes
SHA-256: 084f7435720a943dc2c61155da7e1aee309d78b6c4097cc135fcd2d67802c060

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