Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c6686ab8f4a6d7…

MALICIOUS

PDF

91.6 KB Created: 2021-07-22 20:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cd36253132aea8dcf798e25969c05f53 SHA-1: b136931ac993a56309b9577e49e89964be17b989 SHA-256: 39c6686ab8f4a6d79789df4bb53e51d2a7cb3ad69cb658ebd994b0d39c0fdaa3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF link farm heuristics confirms the document's purpose is to redirect users to external, potentially malicious, content.

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://luxcottage.ru/stroykamen/userfiles/file/82311762044.pdf In PDF document text
    • https://egf.tw/test2/images/file/kexujazisededupitonovur.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/kuterutolagofut.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/6456272275.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7ecc71e2c---depirabudadezinub.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e6a291533---27020183899.pdfIn PDF document text
    • https://hostingyuvasi.com/calisma2/files/uploads/telarajo.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/47740a50b5fe766f588bd79b1095e349/25775966857.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d865014ac86998f36bce4386967f1bda/60768377214.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/o8b0jips85lj7q2mk55222kh43/82385807524.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160ab84ae91282---72434389282.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c2096990e---15750928885.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a998186b43f---baruvebatetaraniwilap.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/95894341546.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3d4270b8f---kixewulokakibodibi.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/57089256365.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cbe8e0d68---romalimalukagapafuj.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/kizepabufurejajikuzisam.pdfIn PDF document text
    • http://apvn.info/userfiles/file/narubej.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/98388380891.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160764a0f4882c---javasorijarumasaxefixejow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=nonprofit+payday+loan+consolidationPDF 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_off00010384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10384 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B96 17356 bytes
SHA-256: 47e392587263f436f95ec5177af0f3d1bc2848064eabd7949f20dd7d565e1970
font_02_sfnt_off00014913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14913 10572 bytes
SHA-256: c5097a7e7e8fa97f9eca03bea5d709896c6a83d39eee9443025ffd7a7cfb7b4d

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