Malicious PDF — malware analysis report

Static analysis result for SHA-256 c69e12dbfbdff3a3…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 15:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 92353dd1854365f8f055200a4043b052 SHA-1: 7167529d57cc504e57aee1bb195e055c75269016 SHA-256: c69e12dbfbdff3a3e2fb1c9707e10620ae273549be56443b550b64bb6d3637d7
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 other PDF files hosted on various domains, many of which appear to be compromised or disposable. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The structure suggests an attempt to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drsuthichai.com/userfiles/files/duruxuduki.pdf In PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/nogadubiduzigevinuniva.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/jafemoxavekanutuvomomo.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/jotuxewuk.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/81318512937.pdfIn PDF document text
    • http://teifsepahan.com/files/file/24788445738.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/nefonodunimavipiguxo.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d782c70965---fujizebedato.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613b86d03f435---73992263348.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/gofosepijixoda.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/kikogejunojate.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/62029757604.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/kogawilar.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/161366d70cd4ba---95850720648.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/11302630304.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/lefijidoxazupupepigepapo.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/pewikuzutej.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/20753007146.pdfIn PDF document text
    • https://ptogel1.com/contents/files/puvaz.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/zumelozatiza.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/71781969618.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9109e2c66---19839671020.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/cff4cbed5a39e1a8c4677fccde7ebd40/15521958656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=minecraft+xbox+ravine+seedPDF 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_off0000e218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE218 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2A 17052 bytes
SHA-256: 827d702a55364bc37625dd134c3c7985e7347f9b8454a1939867d9e5497b5b0e
font_02_sfnt_off00012679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12679 10724 bytes
SHA-256: b442a59a0bd5344e6bed59ea67fb07915b0a2764a5699bac4a1a697992f953ea

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