Malicious PDF — malware analysis report

Static analysis result for SHA-256 c09c9564e9f50a55…

MALICIOUS

PDF

82.1 KB Created: 2021-08-22 02:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b816fe8007afa2e16328cb0b316b752d SHA-1: 4c4e4d1d7b15a56001e905c18410fdc68c05d0a0 SHA-256: c09c9564e9f50a555d9075fd6c2ca792630bbd3104549fcdcd13116ea4dfc450
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress sites, which in turn host other PDF files. This pattern suggests a link farm designed to obscure the ultimate destination and potentially evade detection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/327f56f0f750f859d7a45a38f7a0b911/rekedalesivi.pdf In PDF document text
    • http://hataylezzeti.com/resimler/files/24064022522.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fa357f588---36136370137.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/1cdc5ace72bea585acde8f0ab50dc68e/11076082707.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4e7ed69c2---venugoxuzexunaguxexe.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a18df19bf0---15970952563.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/u4pbjvlf02jje92vklcdnci9r5/94619400229.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160b98c1891f9c---gukuxabeturel.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/4774973239.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/sagekujurozosafisatiz.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/sopukivolewivolevivafe.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/bipuwolunexowit.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0807875001624424126.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/hhhle4l6e59pkrb2vvviabbgq3/fokotejimofajexerija.pdfIn PDF document text
    • https://maisonforville.be/documents/file/69774957536.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f42627e8b9---nolibuvutupifagorugomatum.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d823c44a4bc---52063235982.pdfIn PDF document text
    • https://schmitz.cz/res/file/46698463982.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/67490698814.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/04349bc747ee01ef3abe44133d43f13b/refupekixosifiduguvi.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/virig.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/miniwulozijewejexulali.pdfIn PDF document text
    • http://jljemc.com/upload/files/sonuladalo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=hacer+trucos+en+gta+san+andreas+androidPDF 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_off0000db83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB83 17676 bytes
SHA-256: c360cc2cae8807fc56aa39681180bac8866479ae5d176b3c18d27117551a8aa2
font_01_sfnt_off000108b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B0 10588 bytes
SHA-256: 3d02023d18428db20a6276f1800a547d7e631a5e49c71c1a14ec8e8d7afa7bd8
font_02_sfnt_off000120c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1