Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a13c3b6c57cec56…

MALICIOUS

PDF

81.5 KB Created: 2021-09-04 12:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 958dc57ab6041f12db2c0e1686c597cd SHA-1: b3ee6b18760de0a82d184fed71a928f7ac1a1fe1 SHA-256: 4a13c3b6c57cec56c85378fabd84c7f7e93760d1aecc7d5a0b5b02af1fd914b2
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous links to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The presence of external URIs and link farms points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://originalcheck.it/public/img_admin/file///watuxelukagisuxi.pdf In PDF document text
    • https://monyetjoget.com/contents//files/zojipabos.pdfIn PDF document text
    • http://www.ks-zahnarztpraxis.de/upload/files/wagajakadonu.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/wezilawasidonorisemiru.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/gafob.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/nudowupifedifavagerov.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/kepekodivip.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891df647d5f---92314307004.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/cdf16297139a89525ffd5c13123c8f6d/78167885936.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/92a81ae4e3804c032e02475c54660aac/kunubuxozuzuzuvevali.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/papuvobafumupamejuzufup.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/24671804934.pdfIn PDF document text
    • http://client.diffuse.info/files/rapijetavovewi.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120084393487---fisetudorav.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/xogan.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/8ogbohplv3vj35vd9943ocfef1/gewevopofivevixemexemu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948a837151a---55102899267.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/pebarunakevorinurun.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/683e29d1c9e223c17f43d71d2c6f7199/vofoxawavowixarifema.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/a6763f1e066688c815dc7c0b370ba758/riweg.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161010863bc639---63639492408.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/tokemuxosixogamadi.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4b593a063---siwerazelegekateditadobek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=major+events+of+the+cold+war+worksheetPDF 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_off0000d96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96A 17548 bytes
SHA-256: 355d63fa9f4c81224f5f477c92058856ff762d8951a75914581c3ae6c30d7272
font_01_sfnt_off00010764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10764 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7B 10848 bytes
SHA-256: 5fef1bdbcf1d8862ff47128c2f5951823b78ce0e71113731d56d2e9d84c492a0

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