Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e6ace3d783c666…

MALICIOUS

PDF

91.9 KB Created: 2021-06-30 20:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 219044a947bf95ba96e40fcf37292e38 SHA-1: 56a2aa939f290b501f12bd826df3b1887fe9a5c2 SHA-256: c4e6ace3d783c6660487da524d913201bd145dfd6b8b61c2ea26f842294a7980
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, forming a link farm. The primary purpose appears to be redirecting users through these links, likely to a phishing page or a malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://huntic.ru/uplcv?utm_term=relegated+meaning+in+english PDF link annotation
    • https://parc-hotel.info/file/kenuxavegisuxo.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/dinozejo.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/63ee76c706cdbed098163aaffee0cec1/megabuxela.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609476207f182---27008417386.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/dinekujita.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ea115ada---40160227720.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/qp42h1esvaqnblf46fue4fhsl5/49252347238.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages//files/jesudaxajemora.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef017926c1---zanavufadavaxuzupuv.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5adbeb3ea---wofix.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/95394838270.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/b81607e36f0e529fbe39f2cb3a772e5e/79304196677.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/13690069031.pdfIn PDF document text
    • http://fitviewer.biz/files/file/87448010022.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/466aac519602cf3a30ff6635e8d766ef/82497040501.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/xofobufebo.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4267e2278---tovowetewe.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/tawedurodofozumujabus.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/cc67432593182074a6577b1f097f8cf6/4401975577.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/nikajozurov.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF02 17936 bytes
SHA-256: 850fb8541e04d849d1ea7a147647978976d9ded1e29ceb6e4f12f4a6a9a3b322
font_01_sfnt_off0000ead8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EA 22480 bytes
SHA-256: 8843b577e44ec74de45e58d571fe549749cfd1690c74bba4ef44637d3355f2fd
font_03_sfnt_off00013c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C9E 10520 bytes
SHA-256: 93179d36206178739f27ea4027ba022a55dfd8253bd5244767e94b29ed65465c
font_04_sfnt_off00015415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15415 2876 bytes
SHA-256: e450812dab03168ac231d0a22b01cea9fed1b6e1796d2edffb7b42de28e99c38

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