Malicious PDF — malware analysis report

Static analysis result for SHA-256 439a66175f8ba457…

MALICIOUS

PDF

60.9 KB Created: 2021-06-10 13:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6b0b190b07f991e508b321e3dbd9dc4 SHA-1: f3e46c5370ec80a709fdd7ef4502cd214f30bee6 SHA-256: 439a66175f8ba457b0498ffa6614f6ca104d2ae08b0fa139a19dc667bf739417
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is classified as malicious, exhibiting characteristics of a phishing lure. It contains multiple links to external websites, some of which are hosted on compromised WordPress installations, suggesting an attempt to redirect users to malicious content. The primary URL, "https://irlanc.ru/uplcv?utm_term=prime+video+apk+download+for+smart+tv", indicates a social engineering pretext related to downloading software. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8093

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 https://irlanc.ru/uplcv?utm_term=prime+video+apk+download+for+smart+tv
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/6o6hs9vequsdlr2b720tvmhbq3/69704771598.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/761e6f840b705c6e62a2a2dbab425783/puvixipej.pdf
    • http://montaze.org/democms/userfiles/file/34155648571.pdf
    • http://dolphinegypt.net/userfiles/file/karunuza.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a408e6ec9---batexol.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160be515913fe9---26829231368.pdf
    • https://diaochue.vn/userfiles/file/gowopedojal.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160805dc1c9834---11537092137.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608103d3ccf47---17694153631.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edf540a754---41573459359.pdf
    • http://aptchasers.com/FCKeditor/userfiles/file/47490857799.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16077391a1e344---nitujor.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799137bab05---razufewukizavaziput.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de43.bin
587f357166b38319e32d752613aa7354c0b8abd22bcefbaafcc510e20e35e22c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE43 5404 bytes

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