Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3aa93d9ac6f4e7…

MALICIOUS

PDF

84.7 KB Created: 2021-09-02 07:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8ddf7b9100c323a2bd48878d2cb1eb61 SHA-1: 97b2ee5c78a879b2ea2fe285537d0ccfb328d5fc SHA-256: 8f3aa93d9ac6f4e787d57b7d9084212b7142b5e119779ad0df89310a6e6cd135
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and the presence of multiple external URIs indicate an attempt to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://lescourailleurs.com/upload/editor/file/5958274517.pdf In PDF document text
    • https://tybistanbul.org/resimler/files/jodatufopadu.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/d30476a031b2f2f45906a60e78cf8311/gezezuxebitukewedu.pdfIn PDF document text
    • https://airbays.com/userfiles/file/92984752292.pdfIn PDF document text
    • http://premium-t.info/files/files/8282062550.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/c5e187042f7856a7f7ec3605a2c6991c/54401259743.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a65e7c86aa2---vomerijedisotikepuwubut.pdfIn PDF document text
    • http://acril.ru/ufiles/files/16560043662.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/7pj4m0psdc9v64381ks84nj7ju/zefek.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/wujefonodinixulelurotaju.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/28788499970.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/tavewama.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/bdb5819a547bd88305559a7cbdf0db96/misaselisunizo.pdfIn PDF document text
    • http://uci.ir/userfiles/file/59529818670.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/2e5b576bc65667ffc103f11036bac695/55674526742.pdfIn PDF document text
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/3761569988.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0eb3e859b---bujomonajo.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/bomajipulapakigok.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/noxixilabedilafidano.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16084bd12d4bd5---24416410792.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/777bf8a68b2a76ef0a88f328a984a37e/90639252834.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/35477180046.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/77106467789.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/damofofitutuzirenufur.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/85698623881.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ham+cheese+baguettePDF 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_off0000e50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1E 18168 bytes
SHA-256: 61f0e81ce59a45064e3a94b07e4940f82d889c1e26ae3377bffd3a13c66aab71
font_02_sfnt_off00012cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC0 10444 bytes
SHA-256: 8b027e3155f2b033d53c1092441d8a0744e786878795922a0439eb3c02cd7d58