Malicious PDF — malware analysis report

Static analysis result for SHA-256 563efff0fab2727b…

MALICIOUS

PDF

117.3 KB Created: 2021-06-29 12:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e804f82e69664117ea706f8727416c7a SHA-1: 6ac0d2852bff03b3fb4dd62b47ba2d90c9002187 SHA-256: 563efff0fab2727b7efaf85204d68ffa40a743c52080e00cec1aeb1cd2e53e9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is part of a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9858

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://wastran.ru/uplcv?utm_term=polity+mind+map+by+abhijit+rathod PDF link annotation
    • http://kpotplace.com/uploads/files/71602975614.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/latem.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d52c89c2ac---22928780951.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608141b981ce6---97901749720.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/ae873198158bf4b6675adb9a11cfffac/38858041241.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b242ee51c---vedosexi.pdfIn PDF document text
    • https://x-software.cz/data/file/18080674891.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/24498505386.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdc152e6c2---viteloxuzep.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/86jav1gce8buofibqbmv5ujm1t/78562182856.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/7e0963375cd69d0b92fdb3d6bdf66c1c/36373155058.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b86bcaede2c---34743968208.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/nedewowituru.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ebc4663eb---beropatitopumevuwifoj.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/363aab7512500154667daeeb3e14734a/mutititaraturerimile.pdfIn PDF document text
    • https://stopserv.ru/files/file/lorura.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0e332824d---76620668121.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/7c2916c74f6b2b3cd6b09d482d3ea5f7/wowonakejezijirotufuz.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/kixudagewasegaguvesosu.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/wuwozopigatomubewibi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609891055387f---xanunobipubuwivikuj.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/baljj83kpu2t0u0cm3hs04mjb0/41001810793.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097001b80bb1---53690895466.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/2f20cadf794c868d8861e66c2119e8bd/43034832509.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/2ea6e2adaec34d87c0b0aea9ed9a4a42/77699103977.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/tixokarosotofe.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_off000169e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000181f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181F7 10740 bytes
SHA-256: f5beea5152ce6af467dc4a59cd0168952fafbaf4240fca4e7ac7aa3e2c03f8ca
font_02_sfnt_off00019a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A18 18120 bytes
SHA-256: 355ce9a60c9c0b9c578dfc648a8ff0e71f62d9cec6ca6d31066b8676454df449

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