Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c4231d86091d7f1…

MALICIOUS

PDF

86.7 KB Created: 2021-08-19 03:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 7fca6ae25bfc7e8e17aa07da09aeac3b SHA-1: d4d9f871771b98f15fe05247a388e7142e20e2cb SHA-256: 3c4231d86091d7f1f0e30ad80ee3359be3b653fa0bd09cb196c23f9901caa87f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4039e83e90---zagozezepexozenatiribax.pdf In PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/dijesaxopenaperipate.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/tupapodonowipubavolob.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/39403484122.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f13e4e72168---wozomasevojefepid.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/fofosuw.pdfIn PDF document text
    • http://cezanart.com/userfiles/file/57758010990.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/93214676931.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/be6c4501b9a2d0939961d05da45bc812/33367014486.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0eae1cb63---48056524230.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/8a2b1c2ed6e9c2ec2d9b267bc48c100c/81933866594.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/tarubipu.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/diwuforewi.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608662a17e896---fakanuwizujulaxizijokoraz.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714ba7528fb---kififakokonitiluxuzevesof.pdfIn PDF document text
    • https://alutat.com/data/file/31578664113.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/segetewitimugomosagabu.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/it87jto819nauu0j0gd75bg4c0/mexuvafimar.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/dagutuxovunozivinufiv.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16086af3966569---67151875472.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/35911527494.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/706h43ihjc929lo8l70mi8or5u/povivu.pdfIn PDF document text
    • http://imgfil.com/1gfpd1���In PDF document text
    • http://imgfil.com/1gfpd1-2mIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=muslim+pro+premium+apk+iosPDF 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_off0000ed48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED48 17584 bytes
SHA-256: 7d0354acb76677891fcb9a46ac9db7180d229e03ca7103180dfe9e99ab48e454
font_01_sfnt_off00011ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA3 10396 bytes
SHA-256: fbbd7d2b51e8c255d3ab15cc133a24b49f2300dfc89b8643cb89fb1e2cb6196b
font_02_sfnt_off00013321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13321 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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