Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f33472986c13f6…

MALICIOUS

PDF

85.5 KB Created: 2021-08-19 21:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 423c38c4066e56b6cc6358b211802e71 SHA-1: 0eb71eec9588ea5443d653e1f0783db8c55ab349 SHA-256: e3f33472986c13f6db9c8c2c500281d07a6576d5af16e2958f098924639b32fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF being a link farm, directing users to compromised WordPress sites and other potentially malicious URLs. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to lead users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://oniceh.ru/uplcv?utm_term=emulador+de+android+leve+para+pc+fraco+2021
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087db4c07e8d---19749718743.pdf
    • http://dmkaudit.sk/101/upload/file/19263158955.pdf
    • https://alice-immo.com/userfiles/file/veburijaxotedexobig.pdf
    • http://jdhs77.com/clients/58520/File/56527296575.pdf
    • https://jdlpartnerss.com/userfiles/file/muvex.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607375d796b7a---lijekelaxiziv.pdf
    • http://sowa-architekci.pl/userfiles/files/bamifimutarab.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160adbe473be2e---17265265292.pdf
    • https://agrimal.pl/userfiles/file/8700595062.pdf
    • http://peoplefineart.com/assets/202107/files/20210725125415975688.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e0df74e10---23337122634.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/hes412mhlq78shu8htgg6do4jr/marimajadabamurelijujej.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851104d8b02---48056030933.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607230702f07c---mafir.pdf
    • https://alrukn.co/userfiles/files/17394662094.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608193e43bb69---95569230839.pdf
    • https://coluer.ir/documents/file/gulizejubaxegajos.pdf
    • https://tonthephunglan.vn/upload/files/32977502234.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f697835390---84950917491.pdf
    • http://tbff-bygg.se/img/files/83609949477.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160810b15a027a---xakokanorejibigemir.pdf
    • https://signika.pl/Upload/file/16793768717.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/4afcq727pi0reusj44h8k6cts9/55016345300.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6236372ca---60754172092.pdf
    • http://jarosi.hu/files/file/145179514.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d9697d05e8e---15083888464.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_off0000e633.bin
6d70b5f5dd3b4c53b44affbeeae7422dd00b7a2f254f887420dfe04f3e6e7afe
pdf-font-stream PDF embedded font (sfnt) at offset 0xE633 18008 bytes
font_01_sfnt_off0001134e.bin
93d0908cdbc82d57ab25a2c1b337c52aea454b122524d9f5c8d1e253c41e524b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1134E 10960 bytes
font_02_sfnt_off00012cab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAB 16792 bytes