Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f6838cc817b67f…

MALICIOUS

PDF

85.3 KB Created: 2021-08-16 12:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: ec45930c240ce351ce269f40ed9fe043 SHA-1: e73c3de9ce2a9091856b7e03f9b6a79bb70a563a SHA-256: 77f6838cc817b67f995c8ab235f117718dbcd598cbed93caddc24ef45daa6147
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://wonkingchina.com/d/files/38271334161.pdf In PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3be4987e0b---14032222285.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160986c4e1ae06---tuxopofexenob.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/7qpd4tl9r4okl37p77q8jl2jm8/47977044784.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/paketejinopenibabasij.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/94904158319.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f74c9b3e73---resozuxizezafos.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/81516021423.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/madosutiziwalad.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/biwenezewulaxejumejeteb.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/63173525603.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2fa783217---wowerowidimibamizarakavi.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f93e6a6b1---kuwogepuvazujadowet.pdfIn PDF document text
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/rinikoxuti.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/tepizuwixizaxibefaninex.pdfIn PDF document text
    • http://rc-modeller.se/images/file///vunobuboza.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/tivurenukegusowabave.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/87093063216.pdfIn PDF document text
    • https://petek.biz/resimler/files/junulakosugikuxozasib.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a301784aafb---muliwow.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/cf661c4c9546e14eb6475d930b9c67b9/90144373685.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/85e8fda90e69d86d73c09afd393fcb2d/58317544761.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/5093a095410418b4986b91b129572593/65194612840.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/19202568542.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/90833516811.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/g58024maij7f6m4e85q6erdhne/favaxonamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=examen+de+diagnostico+para+segundo+grado+de+primaria+matematicasPDF 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_off0000e1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C2 19964 bytes
SHA-256: ab855f284a9a1cd273c066004fc818e78a97b2e8ac93820eb51e6f9d0e458d1d
font_01_sfnt_off0001137c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137C 10996 bytes
SHA-256: bed3cf872a8dd199c89f21a9a05bdee102edb8810238cd6a7ce2e9381e167b60
font_02_sfnt_off00012cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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