Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d94fb6f1af9bfe…

MALICIOUS

PDF

101.4 KB Created: 2021-09-09 13:38:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 71fe391d52e9e461a841ed02738a9f69 SHA-1: 0dd3b695fce3e632ef8911786b8c62e888a9a140 SHA-256: c2d94fb6f1af9bfe26ad112058607b53dec5e1497c1aed5518cc273e25a74460
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware delivery mechanism, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161345577d9a38---7453500442.pdf In PDF document text
    • http://ros.by/ckfinder/userfiles/files/40568841306.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/zabuxilegetu.pdfIn PDF document text
    • https://linker.tw/files/45736233420.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161353aeca76e9---84672701438.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ef4f4ebe8---pazokovej.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/paxewalepofixaru.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/364645904.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/47387897395.pdfIn PDF document text
    • http://kahsport.cz/userfiles/file/35349046321.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/67738539969.pdfIn PDF document text
    • http://wdnederland.nl/file/86285262347.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/dulelegogawerimiro.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/87067773602.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/1696972354f82295c0cba0085ca3f84a/senuvopunokamiv.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/jirowodebolurexun.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/wiwutovu.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/9u9js4mmgm50t0k7ogbopuq0cm/70930254281.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/33421216161.pdfIn PDF document text
    • http://fnathservices.com/upload/file/89984685247.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/zelobime.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/miveligoxovezelata.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/50091667911.pdfIn PDF document text
    • http://dreamscar.eu/userfiles/file/62950692984.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=motivation+and+job+satisfaction+pdfPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/28358693343.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_off0001259b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAD 19112 bytes
SHA-256: 756209e3078ac8ed67ae763e730aa03b979d3b22c15d017663e0d9b0477be338
font_02_sfnt_off00016f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F48 10664 bytes
SHA-256: 94ab370ce2c8296f100d4e4112076424ea7b2027c5090b7a9a54bc0490a36184

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