Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ffc5175bb6e9d2…

MALICIOUS

PDF

91.4 KB Created: 2021-07-17 08:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6a835ed96a82e7ce62ed5a6e5586df83 SHA-1: 95f6e0f3fe6253d4784c01cf1120a9633618c800 SHA-256: 61ffc5175bb6e9d27ad62637c27d57dfb0d76261cc47cf92b9e0e029cfcbd6ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards a phishing or malware distribution lure, likely using embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://jjmcp.jp/userfiles/Image/file/xopovilubimatafusofolara.pdf In PDF document text
    • http://asirakademi.com/resimler/files/63451693109.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160779ab8408ae---4859410848.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8396324ec---15252200548.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf5e1cbb9e8---mugurinazuxasabubofaw.pdfIn PDF document text
    • http://geodez.com/pliki/file/83756689935.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084707f5939a---ruwovowuwu.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/88297765769.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608417130e0a6---82729647118.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/61276639637.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/c7363b7df99865c8dc95175566c69e6e/20944636276.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ced7324afc---66256625644.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/5c520528569445347a253225f990b9ec/73910157499.pdfIn PDF document text
    • https://andhimazhai.com/images/files/tenopuwafege.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/40543884043.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/36580487317.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607045670b1b6---xofepadefa.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/9cd1dd2b008d37d840b84befc8fe4269/puzizavewomot.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608c72e7f4165---43889281662.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/22449106574.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/rosavufafareperatunulat.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/mufetijadelaxevefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=gta+4+download+android+for+ios+freePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off00010067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10067 10552 bytes
SHA-256: c82f53c1de5e353755bc3852c428fbba0c939bce7f5e0fbd0a0ea352fcd43d2c
font_01_sfnt_off000118b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B0 17588 bytes
SHA-256: 38b7b8e7faa2873cf108060086152c96245049b57890915285f3ba81190a4c16
font_02_sfnt_off000146db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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