Malicious PDF — malware analysis report

Static analysis result for SHA-256 d24c1ab2824d0437…

MALICIOUS

PDF

70.0 KB Created: 2021-09-26 02:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: afcd4dc1194c2f5174b5267662a75216 SHA-1: f83dc463fa8233e0154cc76a9e01fee1d7b8c93a SHA-256: d24c1ab2824d04370e4a4ef78622dcd1a3a7c382bf8d0c8839deacd12e21ec95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external URIs and link farm heuristics, suggesting it is designed to redirect users to potentially malicious content or exploit kits. The presence of embedded URLs and the nature of the link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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
  • 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 https://crewmak.ru/uplcv?utm_term=vidmate+pro+apk+latest+version PDF link annotation
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/bapovul.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161304e0e7ea3c---murawuvojevi.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/3714164771.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/varidetigetetavufawo.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e62b76dfa8e45f690b7c675b0cc61b37/61003101552.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/tipitofawafaloruxipux.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/fowarudu.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161454df266ed4---ranowad.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/gupoxubobixibimupukiv.pdfIn PDF document text
    • https://novitas.ro/files/19215164074.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/8d711b648ad1d4401515eb084faeaecc/sudazofepepidaxapujixuxa.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/25320228639.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/vomalizezekepege.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/33645776731.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/tesorolo.pdfIn PDF document text
    • https://clinicscrm.com/img/files/manarujatubuwujufit.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/babusat.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613902636d9bb---48080574011.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/14875381199.pdfIn PDF document text
    • http://thepducphat.com/upload/files/sixawixamibegaxujetix.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/natirojamovolukewiz.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/b6510b3948776fd695ff4c3cc386c348/52991164534.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/60913459149.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614c8d083172f---kuwodukem.pdfIn PDF document text
    • http://frchem.cn/upload/files/mivaduzinepotozonasixag.pdfIn PDF document text
    • 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_off0000b430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB430 10680 bytes
SHA-256: 578a8a939c112f97fb04a5ff5395be6c0fce22f2f07b0ecea5de7f0cc5067d4b
font_01_sfnt_off0000cca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA6 14844 bytes
SHA-256: 8ee95ff300ce0098644b6c752e9ccb71ddb797656769cc1fbd57e95837d69971
font_02_sfnt_off0000f222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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