Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7805f0855c8436…

MALICIOUS

PDF

82.1 KB Created: 2021-07-10 05:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 00d112d2395ae234635a98353c947f0d SHA-1: d05ad4c259c49d386328367f66c26ea4dbd38ceb SHA-256: 9a7805f0855c843605e64070753e827f6b0997b66d54027ea5fd7e8b28b91dee
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The presence of these links and the overall structure indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160b3216c92f82---xeket.pdf
    • http://pronobile.de/catalog/file/86958751811.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29ec3b66c8---36372439643.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607547dc9e54b---zediva.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cf8a9bfca---xafedadakovanexit.pdf
    • http://onlineticketreview.com/images/file/35450434166.pdf
    • https://maydangson.com/vietkiendo/upload/file/89916076026.pdf
    • https://kham.vn/userfiles/file/buzuwida.pdf
    • https://lamaisonducoeur.ca/upload/editor/file/zogedubowef.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/crv5i0i0e083cgm20jql2a5uj6/10697729580.pdf
    • http://kameleonhastanc.hu/files/file/30583237800.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/v23iqacj0tnqkuqniu5ndsf4dm/vajoxatisajex.pdf
    • http://srsheicha.com/uploadfile/file/razaledufu.pdf
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/95343541724.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/766fe36e02fa2537045237e1948d5461/6079176869.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/vn01ctmoch69komelbslp32g0o/94469976425.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609ce51910617---25982918959.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1553e7c0fc---molatowut.pdf
    • http://smitheaster.org/clients/861344/File/kuzate.pdf
    • http://ubest.ru/images/file/29818183521.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbdb411feb---14044008121.pdf
    • http://kolasinprevoz.rs/slike/files/12100258083.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=example+of+confluence
    • 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_off0000dc61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC61 16792 bytes
font_01_sfnt_off0000f478.bin
bb434bf97c3a86c378d7653113e94b5bec9c9621ce4b1413a37f681b88552e78
pdf-font-stream PDF embedded font (sfnt) at offset 0xF478 10368 bytes
font_02_sfnt_off00010be2.bin
cfbb447ccb623571a3a394cefd61a8cf9445dc350be0efe00eee8aa2b55e11d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE2 17940 bytes