Malicious PDF — malware analysis report

Static analysis result for SHA-256 669ea6986054253a…

MALICIOUS

PDF

87.9 KB Created: 2021-06-30 11:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 93066a7d5698bb112b96483e7e337959 SHA-1: 7c2a4fec4fefecc18153215dfa4d5b78e16ed5f9 SHA-256: 669ea6986054253add57b4559f43359c3e55a89256b469fb88d5a7f37b465fb3
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://catamma.ru/uplcv?utm_term=pothos+cutting+in+water
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e232644c0e---vasonazefodobusanudip.pdf
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/vetuzezalobesifigu.pdf
    • https://betenenergy.com/sites/default/files/file/46497003608.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac0f2a7ce3---84646715365.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/7ed02a8b5ad25d844947cb3233277190/58786766034.pdf
    • http://kadh.kr/bobod/upload/file/92709782485.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160daae3a7ade6---99423735930.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-16/20210516153324474331.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a776413f9bf---fokebezaz.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/90535bd14074178f6ec47e274b18b7f8/99244416455.pdf
    • http://alptw.com/images/files/fizutalewanaraganu.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c86a827bc4---87699773506.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/dd67b5abbfe4933455cc5b38d81dd996/93163330314.pdf
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/68841275945.pdf
    • http://hodgesmageefamilyreunion.com/clients/c/c9/c95619ca3ec29dd030dc8935b97378d4/File/sawoxukuzopusaloxuponiza.pdf
    • https://fullhousetourism.com/UploadFiles/file/20210528115632100.pdf
    • http://bidmitt.com/img/files/file/fedopowenugegagu.pdf
    • http://refpecsbelvaros.hu/kepek/files/6826846482.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/lijobumetepimamiz.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/54d89f66a7bffe4c64440f0b30f4b0eb/61968177997.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b55d10480fb---rozit.pdf
    • http://www.aqsclimited.com/EditorImages/file/pokof.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_off0000f2fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FB 16792 bytes
font_01_sfnt_off00010b12.bin
b2d9dfcf8870b2ad889b51ba5bcd0ea0eb3bbe11514b67713153b79de80638f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B12 10652 bytes
font_02_sfnt_off0001238a.bin
8d0ab95ab6125b54a589255b0723ddbd3a919a8ff9b3b8ab59967bb7f175303e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1238A 17888 bytes