Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb36c01d57dc82ac…

MALICIOUS

PDF

149.7 KB Created: 2021-08-09 21:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5b1fa5e370987b2202581018dacc23a4 SHA-1: 1d6d74ce9286f6c0dccd9be7eac477d8e7fe0e42 SHA-256: fb36c01d57dc82ace40229d26121bf301b5621122600e9e07d69acb7842d9dfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://ok-poland.com/userfiles/file/kakabad.pdf In PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5093d8c6e---75543421259.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/zesoniwamemovaza.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/15946317562.pdfIn PDF document text
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f354c6200e---nuzezax.pdfIn PDF document text
    • http://greenbrier101.com/userimages/gokijedajobepanixorogazu.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/vs0d1iuv6m4fv6p1sienit7124/5103665779.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/5o0eedma2mkn7spvlm1fknqth7/sokelilukiwopusad.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/xasoxinomata.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/pefotomenu.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/miginowagozevejitadunozej.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079d4c7d61f5---57743043781.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/11540932230.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160819b1382838---mavogesan.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16074089d61083---luxoremevinifuvozexedon.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/bawizotes.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/c58b4b4eeaa661f79207ff96ead6c369/sifuwibadaxozil.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/walofedalovisukarufegedi.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/kh66vbt5un91q7td76tem2uiq6/67001001224.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4c0a87ab7---ruguzivabirog.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/a932d7a74e91734bf1b707eef90535e2/43226555739.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080e75894381---49784356979.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/465a97b9434a24c529243c9b04f1e0ff/lejovopolopuxazoj.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/igjtrban8541bh7dcgpsk6b688/9129262202.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c85a998db67---38183299111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=fundamentals+of+management+robbins+9th+edition+pdfPDF 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_off0001e444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E444 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001fc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC56 18156 bytes
SHA-256: 96ee061e516d0da9670d67d99496774512fbe21409ae546c054fb5468784c903
font_02_sfnt_off00022c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22C6B 11328 bytes
SHA-256: 6136621b987b4e8a0a66efe3546555f38aa1998839ba7abe3305bca833a4f09b

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