Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5703eee9fa2feb…

MALICIOUS

PDF

89.0 KB Created: 2021-09-03 15:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 12a43f0a7f53b8ee16029473fbe22ce5 SHA-1: 35ad54fa48378822e848a1d52ecc1a2dbe7bc693 SHA-256: ae5703eee9fa2febdb16c50cb7138eec0f1cd1deab386790a75e6291d7d1c8f8
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/040ti9919usq9ei9utugge79g9/xunozotesanosoluruxogat.pdf In PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/fa0de9c426eb93ed928cd22d11bd5033/vabemulukerikozukafu.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/dogadomeb.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/a07d6m5s21aqimhfe4vfltd3hr/32586005631.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/doronugojujulovunizeguwiw.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/tonuxafezilivove.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/toxorikodaj.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd708eba41---48833726096.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/46093024514.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/dezuzinakafodimimaken.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/59862821446.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/hj3oma061nli4lfvosf1f8oe72/1979913914.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/13659781105.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/d0d68937a4877bc1d1d5e4a4a1fefc8c/togogorurop.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/kcvb3vkej83smpisf14mdrue36/taduperixanamatosujufufor.pdfIn PDF document text
    • https://negaratoto.com/contents/files/tegobalewogin.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/93be1c0927b535e1f61b7a1281bffae6/repakekadid.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b6a7dd868---sepeputoxuvifijom.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/6c9ba2936a38884a5c100e2e603d96f7/zuzolikux.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607490450c8e6---5548393015.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/faxidigogajogafa.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/35795595716.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/vedavivusekudusubex.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/21198575247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=sample+essay+for+ielts+writing+task+2+pdfPDF 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_off0000f3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FF 11328 bytes
SHA-256: 91b0829c0dc0850c3a9931e7e5c0606a476b8b19f2f00dc3a2bbd3f0529f3b8d
font_01_sfnt_off00010e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12699 18448 bytes
SHA-256: f74a04fee921ac647d27eec0269f915868fb001e1297c7b872b57f455c74147a