Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3458171e76dc5f2…

MALICIOUS

PDF

70.9 KB Created: 2021-09-18 14:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fc3403531ceff5348ed1adaca02b5193 SHA-1: 4e2065fedbf610dbaf9ae5b9825290c9a3a28718 SHA-256: d3458171e76dc5f264f87a5a0fc9140e45050609b3f1853a136b571df65b036a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. The presence of these links and the overall structure strongly suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://e2ingenieros.com/ckfinder/userfiles/files/denanuwokubovipi.pdf In PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/mupela.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa9356af87---dosekekunigagimabikek.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/1630134024.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/84745679973.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/gewuwadadiguz.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/45951980487.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021090611574543.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/mukubafopipumatipifirosak.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/92907242220.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/rezifikakada.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142539f025c6---netililosetowixudejulorot.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/gewumuzejatosukon.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/tunepodoripanurazul.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/55442185632.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/b20a40fcdf537ba62155bc71a537d53e/25660491905.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/vigiwi.pdfIn PDF document text
    • https://msvadba.ru/files/file/jotuk.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b4fe980ecb5d744cda716f4b31cb224b/gugunaralosofek.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/44470856262.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/wulosanajuvubabe.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161376aba5180c---kowitu.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/wanuraguvigogugima.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/23581179767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+screen+record+on+moto+ePDF 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_off0000b595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB595 16836 bytes
SHA-256: bc4476aae7947d4872ba201acf88ea080596e5a9a20321304d26917263c77ffa
font_01_sfnt_off0000df0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0B 10308 bytes
SHA-256: 241ab17681272855cb9b6db3ce16d82839febc074530994c5bc2bdc9fa5f78e5
font_02_sfnt_off0000f64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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