Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bfc86203b8a6348…

MALICIOUS

PDF

71.0 KB Created: 2021-09-02 20:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: df4ec5cc2d8daac69387755ecc31a564 SHA-1: dfad9b588cab603d8d2ddce77ec3cc18c1a3241e SHA-256: 8bfc86203b8a6348a591a2e63c4daa748657d224f837e4fc98c160572a829976
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 for 'Pdf.Phishing.Trojan'. It contains numerous external URIs and link farm patterns, directing users to compromised WordPress uploads and other disposable hosting sites. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this file is designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crewmak.ru/uplcv?utm_term=cuisinart+coffee+maker+automatic+grind+and+brew+manual PDF link annotation
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da27bbb5895---51296327735.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/46410981220.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/famorofub.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/88518756043.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210623045603.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10655c0276---67572115906.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/40111658086.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/86259547977.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/b2vcgj4a753q562tfv109nj65p/minoxojamatapofonolosas.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/sexen.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3084b3d92---71581700599.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16100b1b0d9ce5---82196316644.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/kenazorebogedifoparesul.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/jolekamumevadigobivol.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/12cc5530970df7b7bb1e624cc5390c5e/nupirajemezuzija.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/7334971b4206d53053520a374dd4ddcb/zudagowibe.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac92eb7ff1a---javodigefozutetidedi.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160959e4dd5c40---46761806028.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/lidida.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/873ffc60f132ad5a1fbb441a81f8fd9a/64713894707.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/fa3490fc372d9b7ffa8ca8e12648163b/dukununiv.pdfIn PDF document text
    • http://szhlfz.net/upload/6304730703.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/70884672564.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/medugelegatu.pdfIn PDF document text
    • http://poorclarescork.ie/images/26946413136.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_off0000b3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDF 15628 bytes
SHA-256: 804bf9a2766e9cfd5532c5e91da424da553e2f3757a36519f4c951060f0a229f
font_02_sfnt_off0000f3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D6 11268 bytes
SHA-256: 845cd19e88424a2c56cf21fce7ea8964349f9fd6f784e1251d71beef4c6cc5e4

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