Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b5546994139e7ff…

MALICIOUS

PDF

84.2 KB Created: 2021-08-20 12:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bff1f2c6fae8896ac56c3fd4d8879b5c SHA-1: 35ff13cd9408a2d7eae5390b0ccc6c5224ef4cd8 SHA-256: 2b5546994139e7ff7877ba192a61dacfcc4e10da67ec1cc016db406fd173953f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to host and distribute malicious files. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160acc4388bde7---zapif.pdf In PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071b71395323---pekiz.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8017ddf3---68372990447.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/66514005903.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/cfnqmscvlngq7r1a4i9mfgo3r7/nazaregowazuziwa.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/89544268268.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/baratoxoxojazajiximoteg.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/7263225463.pdfIn PDF document text
    • http://cycling-software.com/files/file/28752603944.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/41fd425ad0830a280850330be97c623b/gatoj.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/uuru7im5qedrs0caibd0u5m1la/jebabozetulikatexijil.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f22aff73f92---mulipalifuzike.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/u18glv82h50ph7sm6fvhv27nh8/53969063591.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/29319269590.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f5fc5173a---noterunusuxuletepuzo.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160edd52fddd05---kanaranuvukefokujibu.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc8d28b268---vamozik.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/7119287931.pdfIn PDF document text
    • http://allycatering.com/userfiles/37871011730.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbc8182f87---zeninulurixatiza.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210702181327.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cba21c0a6---sujopuzupusep.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/58549487791.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/davafavapezi.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/76617127195.pdfIn PDF document text
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/41266562379.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=what+are+the+4+major+biomes+of+south+americaPDF 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_off0000e5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C0 16912 bytes
SHA-256: 1cadbb8fb7b9cf225b4092b0b83f78b5eff169d08e1c08b5d98213ef1373f144
font_01_sfnt_off000110f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F7 10892 bytes
SHA-256: 5a2aae78977687cbcfdbb2c51602a618e41c07976726e7a5f08339e5475cdab2
font_02_sfnt_off00012a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1