Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa7ff2fcdd38c02…

MALICIOUS

PDF

71.5 KB Created: 2021-06-25 13:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c6a0e600aff9fcdd868969c4686ecc14 SHA-1: c6ff21c7d2ec675c370489ed644538bcb6f33722 SHA-256: ffa7ff2fcdd38c02f71e257c4f43fd4fe179cf2cc471663792c5492a92c5b800
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and the nature of the link farms indicate a likely spearphishing attachment used to redirect victims to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607a373e46e29---dabipakopofapudibirazu.pdf
    • http://files.ibiza-ferien.de/file/beretolerupuberanixot.pdf
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/birokibipodididuloreka.pdf
    • http://stellar.ru/ckfinder/userfiles/files/xifaw.pdf
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/65055937465.pdf
    • https://genericdiabeticteststrips.com/userfiles/files/68691358561.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/627a89b1641d3a8a6bc350eacb825fc2/toxikigorovenixagabuku.pdf
    • https://clumba-indoor.ru/files/files/jixigokutonixu.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/icq1cg7o6ufhfoiefsf8nol8s8/9719883379.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/mppsqpc006i2gdpuu19hli1bgv/bejuxavezopudakasovubeg.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c58d6250014---fogumonawiwire.pdf
    • https://solidpractise.com/files/userfiles/file/xunosomaxoxusifu.pdf
    • http://e-sportis.com/images/upload/39637581504.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=chemistry+question+bank+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b34f.bin
3f8a965e190dc633b5a4967e2646c5668513de0fa6d4447139ba6308c113233b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB34F 16376 bytes
font_01_sfnt_off0000ddbc.bin
06bae80916320b2f2538cc4d836d2b772df76b52a20efff7ded1174c98732ca9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBC 11340 bytes
font_02_sfnt_off0000f7d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D9 16792 bytes

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