Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff0440304b4e4f0…

MALICIOUS

PDF

62.3 KB Created: 2021-09-11 00:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 101b88a3a79bb7b978c079613ecd179a SHA-1: 01852d2cb5560b14c388cd0c7d2ecafeef6b84b4 SHA-256: 9ff0440304b4e4f0c5892f4c39bd52c9a37177ce5d2efcf4d9b2428a97e8dcfb
154 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple websites, some hosted on compromised CMS platforms. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests the PDF itself is the primary malicious artifact, designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5774

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 http://studiodugnani.it/userfiles/files/pipunejok.pdf In PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/rupuranesotax.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613373735900a---29268024455.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/82201621504.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/vasuletamobopopuzotig.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021090821515973499.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/57289426054.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/40947330417.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/talijowovisigowupowadoti.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/xesapazuritira.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/c44ad94cf50971637ed50dc7f6a0a58a/15644380740.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/67621108371.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/46380830797.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/38911845680.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/wuririsatesesogogogimibe.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/69257231799.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/vadefewiv.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/57567016207.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/wixojamiwozifi.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/15216757389.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc907af810---dusapasosusaxiga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=yo+instagram+mod+apkPDF 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_off0000b7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00B 15288 bytes
SHA-256: 6758da0c77e8ba7fd74552d9eb3b02b7a35812d131361858c90c4b5836963ce0

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