Malicious PDF — malware analysis report

Static analysis result for SHA-256 0823bed1aea4f1ee…

MALICIOUS

PDF

81.9 KB Created: 2021-09-01 22:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3d6635e35552b61fa0bfa3234b68f98c SHA-1: 36eeed5e32340dd5cba865284d680a72c4ba82c7 SHA-256: 0823bed1aea4f1ee9081edf9c0808d01e864d9d1d08c398f384bf0e237fa100a
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised websites or disposable hosting, indicating a link farm or SEO manipulation tactic. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it as malicious. The embedded URLs suggest an attempt to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://soechi.id/userfiles/file/zifinawatodolow.pdf In PDF document text
    • http://t-p-fortune.com/userfiles/file/kikutegogesabifewi.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62c695c7af---24922459041.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/wapul.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/54110133558.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/r8ffl72fj203d1vv3vaq9nj093/bumumamodedasixad.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/dunumumobopuwakus.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/39390147752.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0871c6ddd9---51434181021.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/npra7kvjn729cm4tue80va0gj9/20698468084.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/xotedajexirevisitud.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/59895008471.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/48634593861.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/jepudoduxipugusomiduje.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/71053185813.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/n1gbt1ta5fudtt0uv83ot2i8l6/suwuxagi.pdfIn PDF document text
    • http://wenxuezj.com/images/File/82954471424.pdfIn PDF document text
    • http://amdind.com/userfiles/file/rokekuze.pdfIn PDF document text
    • http://rotang.net/userfiles/file/15160600955.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/a51i3g21ee3mv0lcc90gkb0a2r/41036319478.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/56489585aae8268f588426dd96421cc1/zogaga.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cda137bdcda---ximunepekezi.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/a3f361c0e68d09bf2b41b92969adbe55/40362410590.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/6p2qn77s33g0qv5iee3e8ncu2u/fiwomamosejakidunutitoj.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/a19ab073cfba2faea5c934e4ab70dc38/99854992451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=bedside+clinics+in+obstetrics+pdf+free+downloadPDF 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_off0000d5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B0 10892 bytes
SHA-256: cfb7146b302d4034a75b33d177e670f0d066474a41dc5752a722654c2e9f2a27
font_01_sfnt_off0000eed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED6 18336 bytes
SHA-256: 9193f0a82377def95f9ec83ac732a8ca246aec15936818f3b6df28f93aa4a806
font_02_sfnt_off00011efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1