Malicious PDF — malware analysis report

Static analysis result for SHA-256 121aafb54f9c0ee4…

MALICIOUS

PDF

89.6 KB Created: 2021-09-02 09:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 992fbfccfa2db9533f2c895b16d718df SHA-1: a91571b999943ad2dcd2d3a2d5bd080317f62861 SHA-256: 121aafb54f9c0ee4c8675378d1a8c8d708afdcea3133e678ebf2790fb8c80374
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 0.9991

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.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d558eb05dff---94169903860.pdf In PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/6032cdeac779e4658059abd20f8908cf/18514756327.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083600f622e4---32179232677.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/20202816692.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/c7b442b4c7083ce134e3d45231c6396a/lufexupefigisove.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/fujubenamuk.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/fokukinejedaxatelelugenas.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/e5o1moof4njqjanen58cs8noju/17847367654.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864e694accd---41920235963.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c041dcbc35---82353714462.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/53a94587c4f17fd550a7aafe0f3062b7/serewibutenomajan.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/jokiniputovof.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/13604135865.pdfIn PDF document text
    • https://www.aeap.com.br/ckfinder/userfiles/files/fokenizidurebinuvisuron.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b46a06a12d---pojuvuguge.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/tefoxixamolo.pdfIn PDF document text
    • http://mayjack.com/upload/files/dusuzitiraromadu.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/xopelujofugoliposiradinuz.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/gakozesesazekikin.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb4447b55b---pigajetuzunezarokulujuvu.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/kovafemegofa.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/43808471430.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/baminelixerexulumudimufug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=what+symbol+represents+a+warm+frontPDF 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_off0000fb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB52 10864 bytes
SHA-256: df61a41583ccdf1f4ffa53d81a18423d90a715bd155207ea1d475b31ea02c4f6
font_01_sfnt_off00011424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11424 16972 bytes
SHA-256: 762c6eb10ed082517a45e90e6e52b02471a6e1ce07edcd423c25b4786efed324
font_02_sfnt_off00014004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14004 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1