Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9db2e0e564530d7…

MALICIOUS

PDF

89.6 KB Created: 2021-08-05 03:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 63999ec25d681a18b3dfbae8b82d50f4 SHA-1: d8e1bf02395c5c9607b6aec4c9121af3dbdda2e4 SHA-256: b9db2e0e564530d7852d5f1f62fcf469775c4d3cf8e5558c18ab53374fac32e4
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories, likely intended to host further malicious content or redirect users to phishing sites. The presence of these links and the compromised CMS upload farm heuristic strongly suggest an attempt to lure users into downloading or accessing malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b3759e599---godilewesekelineroranuv.pdf In PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160930ec39fcac---23908162338.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160746f8440db6---26256097024.pdfIn PDF document text
    • https://csodamalom.hu/files/files/21120788605.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/26206169166.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/powedamejazijaxumonazeror.pdfIn PDF document text
    • http://bptramptour.pl/files/file/68003484307.pdfIn PDF document text
    • http://screen.by/images/file/52969428864.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fad603e022f---jedodokid.pdfIn PDF document text
    • http://skncn.com/u/files/51963033101.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-7///202176212457866.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/17655796465.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/42119f4780415359b1fa69ff4d974c5c/bixaruwunodefasebutuxego.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/31439258038.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/vuxadesesilujuliwabojube.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8e5f53cc5---godim.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/sabufuloromiwuz.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/60011801254.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b18e26dc17---kogepajokuvujagasume.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/juluvimipobomipi.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908dc17b120---jepak.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b322de9c8---43846459792.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/zozavopu.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d5258b4a20e---todunigez.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ed71c584f3408633e27ad349d773a4a6/45721923841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=best+interior+design+resume+template+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_off0000f8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C7 10976 bytes
SHA-256: b0630318b8b04bd24abca4c6660abd33e659ef3d010b2d9522ef64cd90298f95
font_01_sfnt_off0001121a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2C 16904 bytes
SHA-256: 629e3dfcccd7cece19c3017f2a1618c9aafe79bb66b297e6a0651c0394e967ea

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