Malicious PDF — malware analysis report

Static analysis result for SHA-256 c398aa3fe2eac9f6…

MALICIOUS

PDF

82.4 KB Created: 2021-09-03 20:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3acfca242048c80c64a740d76197c0b7 SHA-1: 9f97d789a057572962bd3a4341f07f222b35e734 SHA-256: c398aa3fe2eac9f6996a5559323fbbcbeccda871f5aa13aceeeabf4f925bf070
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to external resources, likely to lure users into clicking malicious links. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=syllable+patterns+cvc+worksheet PDF link annotation
    • https://glbtrader.com/userfiles/file/gizevuje.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/3309016d1af00365cea6cacf4f203a5f/lasemapisigarisarifixedo.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/8bf66a4e916521307dce9ebe6b1c0ec6/tadexurumugiwoxoxugi.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/68695671720.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/nojupagofulewosimuti.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722ba0d4643---moliferitujuzi.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/25597087807.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088169f71a95---poxozefirunewanu.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/vakuriw.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612c355e60e80---zapepasazafojif.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/fikax.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c7dea2ab8---diforalofitutakovedidos.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/dokawesuxobamixut.pdfIn PDF document text
    • http://rilta.net/userfiles/files/fofuxidi.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5041aca675---10996654137.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/66bee88bcb10c1f91176b6f523f1c3e4/golifur.pdfIn PDF document text
    • http://gtshotel.it/images/file/28064353152.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a0c1f8f2a1250b100882e8d750f9a7ed/9052551717.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/64010664152.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/a801712f1bec874505bd37a5775ae519/wewelukavijo.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610245e612fe1---38953584484.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/24f6d8e0ab0d0b17eec57bbe95e58b64/92927229750.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/mn5osr5vuh4mhcv9vs4bk3g4su/35306968318.pdfIn PDF document text
    • 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_off0000db44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB44 18060 bytes
SHA-256: 2e1290e8a6bf727deda9954d7899c87495f813afbe580e3c757e7fd36a810671
font_01_sfnt_off00010a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001229d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229D 10952 bytes
SHA-256: 08224241d4970b5c8fae8eb68bfbbbfaf8f7b58014eb82d823aa0318bede95d8

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