Malicious PDF — malware analysis report

Static analysis result for SHA-256 18fad06ca7742d2d…

MALICIOUS

PDF

84.3 KB Created: 2021-09-01 06:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 12e4efed134cbf044a4a76d5becba490 SHA-1: 43ad5c29eb46b28ad413223a237d7bb70ce8e4ff SHA-256: 18fad06ca7742d2d2afa802648560d23dedeeb16f7189f4f8994cac645057fd3
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites hosting PDF files, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead the user to a compromised or malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/bc36d25c8b187b1d157dfe3585ed9e33/fakeledanaxowemikonotijo.pdf In PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fda1d2924---37932932846.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/p5c7jh4in34ldib310dl97vat6/83851220367.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/fa9ed24af576b49e4b3dc9d6a3eb232d/55788959514.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/6d7ad7e6692add410b9e75741ec2851b/dutazinepadagatuwupujo.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/26209742074.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/2msl7eq70mo2i907dkb1cq4uag/57522208800.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/xiranobopamisolubofubavi.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a36a23acf---jakitiwid.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/livopakobinazukiwusike.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d21d42a7d7---xipuzajuxazebazemowusuwom.pdfIn PDF document text
    • https://abeess.com/userfiles/file/puzogudida.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbfed6bfadf---sewamajuva.pdfIn PDF document text
    • https://mfdesign.hu/files/file/1773677441.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ch3k21ntq4gpu12invvn7r4dq2/wajoxorajabuwogezaf.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/ruwopugamozemididokisiru.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/60432451677.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/mamofalumozatenonebuv.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a17acc2ff3a---69416421703.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf67fe4805---32767096191.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/a6e158143553385f71f72123ba7cb396/xupawexiz.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/677fd7ed1ff17db78e59d0c040a170de/6462838223.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/mibatojazikajakixaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=octopath+traveler+side+quests+guidePDF 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_off0000e336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE336 17696 bytes
SHA-256: 0fda48733d7a30dad325da8cbfe7231f25e14c890ce02b9f80573dc4cb4801ee
font_01_sfnt_off000110d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D3 11024 bytes
SHA-256: 7666045f853941dad371a79264b41ab282805004bd28e4b1e1868df8b3923492
font_02_sfnt_off00012a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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