Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdda5127e8045f48…

MALICIOUS

PDF

89.0 KB Created: 2021-08-03 17:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c50d545bb541afacf09d3c427dd5a24d SHA-1: d191a7c9f7d59cb30c1a984ee26dc13ee2556235 SHA-256: bdda5127e8045f48ef46485c62351e85e0d80153aa23cf2a5981d6ea190cc5ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting and compromised CMS uploads suggests an attempt to obscure the true destination or leverage existing vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://bassbasement.org/userfiles/file/33041985070.pdf In PDF document text
    • http://sotel-perm.ru/site/file/49571042394.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/xifogizemisubajolesodil.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/duh9c0f441306cfrut6kl7hu95/wipitutolu.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1b7b4bfe4---47360990272.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57b12cd151---fadabekixamuxi.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cea5622a60---65895506941.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/rovasavajebibat.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/26380825442.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/830d7a27903510243e99f67243310cca/nadutetijikozitudu.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/74653207309.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/7d7g51l2ho2v98upebkru2t3uv/37934346534.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/jowopofaletukunu.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac1d3b42d8---73204809836.pdfIn PDF document text
    • http://pronobile.de/catalog/file/kikak.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077b3f8f21ae---26018086305.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/25282769264.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/labotedavuditabokewif.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/cquc7evvnaot186ef0j6sas271/43849388795.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/11738900696.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/ue8abmbbmiarbgu9ib1iuq9oqs/nofekesopulixesoj.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/a26efa2cc29b7c5051513a4d8ce4ee16/fuxowizinibu.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd44121b18---sudomanigojawidopiga.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/7ca6255f49db23c2465a424ca2e918b9/xabud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=bitcoin+mining+in+browserPDF 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_off0000f850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF850 10644 bytes
SHA-256: 2ba07cbfe5554bc7c6455d973f64b5b97ffbe5d849d1393f9f00030892aca998
font_01_sfnt_off000110c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C5 17068 bytes
SHA-256: 295edc452ba3fc89f60a6dd868b82615478892ac005e7c09dc83fa39dcf6337e
font_02_sfnt_off00013d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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