Malicious PDF — malware analysis report

Static analysis result for SHA-256 254499cdf6ad6e1b…

MALICIOUS

PDF

82.6 KB Created: 2021-09-03 13:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 47ba64e3503588a9e554ac77e14295b3 SHA-1: 32741984b57276dd6bf6eb40485a2c33dc765c5b SHA-256: 254499cdf6ad6e1b94ee1a51bb6f266fd768141c9b444b30206f769aa29cef2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign, likely using spearphishing attachments as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=disney+tangled+story+book+pdf PDF link annotation
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e6ff81fc5d---gaxewi.pdfIn PDF document text
    • https://curvy.tw/upload/files/73693145839.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/43967070190.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/64061382530.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607f13e0040cf---38982253626.pdfIn PDF document text
    • http://dchs80.com/clients/c/cb/cbc185099defa3274d3d4f74835fd64f/File/rogaro.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/fojabunewozipi.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/lugulepinonoki.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/93757618289.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/towigidigave.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/88174353043.pdfIn PDF document text
    • https://terryhaas.com/wp-content/plugins/super-forms/uploads/php/files/fb646ca5245048a365772530e451d5f4/jaxonokebobunofuzeze.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/zinixagixobo.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/vujavigiwumaruvas.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d4aa47681---tases.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/55973945736.pdfIn PDF document text
    • http://lucann.com/Upload/file/45151148244.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b9f03c9e4cff2fbe8f71dfef02d4198f/22238483407.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/sozewolinabenefibebekedak.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160711208c0ef0---jukifimibevor.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/xidode.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/xuzekizenixujifub.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/67620945268.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/c7nk0tvckqnt1r80rfg8ssc3e1/liwopidafatex.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/60420490819.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_off0000dbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDE 18440 bytes
SHA-256: ad5620e766f1df5736c56a7b5dce7a1099017a69a1d62e958cfa923e8ea0865a
font_01_sfnt_off00010b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B36 11020 bytes
SHA-256: 42e9e7e7a3611afca16e7463bee05871d34e5614930cc9f2928821092e82289e
font_02_sfnt_off00012490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12490 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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