Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ef51bf384b5510…

MALICIOUS

PDF

75.6 KB Created: 2021-09-04 01:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b9cbd61ad64ac330334870947f6a6930 SHA-1: 2c771acd29c68a2f9775a31cbdc5887931020dd8 SHA-256: 10ef51bf384b55104623156ee42eb1088a575ef1c12f01e4be83b0313e75cb8d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to host or redirect to malicious content. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supporting the link farm nature. While no scripts were extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16085f37cf2cf0---rifusinuvefanevap.pdf In PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086c945a3240---20274655064.pdfIn PDF document text
    • https://ovth.ch/userfiles/files/liwiwusow.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/xonibefanorunari.pdfIn PDF document text
    • http://71mhsreunion.com/clients/f/fd/fd19d29f3ef40f7e1d0269d1df38e7d4/File/90386840744.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/5877255df274cfbfdcd6797e939718c9/pamudumajitezibitodoloxer.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/wosejulumamotetudu.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8623e11488---30418019165.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/81065226648.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/zemaxakulajixivavagut.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/rabadojikopomodege.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81ccf0181---61642709429.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/b2cc3b3809edc3eef07da80a4191fcb6/15611198099.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/0mv3rk45r2rhes3g8av2d78es5/78904034608.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/venigotijexajewemubun.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/9b8e000ddac3272f8c929b982541e944/faxadulol.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/ed588e4cc6477b517b166aa55247ca60/80904903504.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/benawufelotawalukikorafiv.pdfIn PDF document text
    • http://mega.kz/media/upload/files/3921763421.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/napabokuwo.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b44fd50b7a0---bunijituzebowuxokaz.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887b7a6913c---xilekarizigekej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=oracle+erp+system+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC461 17088 bytes
SHA-256: 51a59c8d9732c1943ab2b19e3844b422fc94058c47130b28384d840d39e036bb
font_01_sfnt_off0000f06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06C 10604 bytes
SHA-256: 89efc09b507d0296c11adb2ee6b9988ca076aa292f9e3cce5b0daacf1f88658c
font_02_sfnt_off000108d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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