Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3ae873b1aa8ca8…

MALICIOUS

PDF

87.6 KB Created: 2021-07-03 00:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ae8af2b5135a28bb612f1e1382266d10 SHA-1: 8ba9c58d81bb60712e0ed47eeaa7086317b0dd09 SHA-256: 8b3ae873b1aa8ca8e3021fa5cb9da0faba69e9365a8daed069c64ebffa6c6b57
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious and exhibits characteristics of an advance-fee scam, likely attempting to trick the user into believing they are owed a prize or parcel. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a distribution network for the scam. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent consistent with phishing and fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/91cv836529dde04h2luutvklb0/nopovewef.pdf In PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1609bea1a3f76c---kuliwegajexe.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/e4c8a317ae2d7950d9caa5aa3122f99f/28508199317.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b214f34f6aa---82945146054.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ddf84b15d---47698827115.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086eccd213fd---81899238083.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ca977263---49875673624.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210526091402.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/p36u2iplirdiafqbempnl4ip9s/sodulopadamuko.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/35obg473qij01k44vhjv02d114/fowakelufureji.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b349a06c066---92419797986.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/4001090093.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/38547532396.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/rebdiun68qmo0qlgivn1fvobkn/24684941668.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e57633b93c---31138459967.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3a78e9eff---renukokegopulidedilaxoxo.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bf520013dca---7948367314.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/37720323747.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884092c77e0---55451497817.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dbfc4ba2d1e---jufij.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88e6e5c295---bifig.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/mogutigafepo.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabf1542eb6---bijogig.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/c5784b1702322fb8a76cd505c5195e5e/nutekesalemepumedaguba.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/5284d4508bdf72ca7605174e7960c82f/ximokez.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/95950889448.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/71507032523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=modern+adaptations+of+romeo+and+julietPDF 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_off0000f40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40E 16740 bytes
SHA-256: df7bc4668f2e52cc953859b60fceb832c40d290f99d3f39207efe039c3b4a7b0
font_01_sfnt_off00011f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001377b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1377B 10884 bytes
SHA-256: 21ff05371eaf8f8cb719f88f7c344e5acdebd253d32f9f5c7d3caa37420061b1

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