Malicious PDF — malware analysis report

Static analysis result for SHA-256 266d4f17c41bb3d0…

MALICIOUS

PDF

81.0 KB Created: 2021-09-05 15:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 33afa0d11686ffdb1aad67ced5dd35f9 SHA-1: d46bc29deda3f989fc69192f497e5007c736287e SHA-256: 266d4f17c41bb3d0acc69ce58667a3ebb8eed3370691758809089445d0aad2c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDFs. This suggests a phishing or redirection campaign designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://northmarking.com/userfiles/files/nexikem.pdf In PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607128d20f19b---17141548092.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202108291149039876.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/43915232177.pdfIn PDF document text
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/78061915900.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82696058108.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/54bm4a3njb6ka0180ab8cgh3am/sukexawun.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/63345209563.pdfIn PDF document text
    • http://ashioke.com/images/library/File/ziwonevoxu.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/ba2e079183ba1f85488bdacd30b84ccd/92514399335.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/1a7695ac304a59aca514e6241904fa88/mifefuwuvagakixafaxesupaz.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/dikejemovodofuwusalaw.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210604114721.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/25222017293.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/8a0ddee3217bd38893bc8a1e90a6cc8a/lijapefowifalefuk.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/focda4t4testcfc99j50hmok23/rexafono.pdfIn PDF document text
    • http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/xeneselatofaropafofuv.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/c290db474d684820e906c2ee0ea42bd1/53212483656.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/durajomasoratavozigiluger.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fce3026c883---64802131256.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/lawutogokutojadorumega.pdfIn PDF document text
    • https://dock-levellers.com/upload/files/tujojoju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=implementation+definition+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC7 10344 bytes
SHA-256: 7ebec07a6ef589c50289e633206352fe3ee736a24e78a7cbe0047fe1600f7d5d
font_02_sfnt_off00010600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10600 18692 bytes
SHA-256: e67850dda87c44c756aec09afc89ddaad9293e075d3f64fd64868ceb6ea6f11c

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