Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f04c4b24abbace…

MALICIOUS

PDF

69.8 KB Created: 2021-09-30 11:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f61343198dd2a85c561d757e23588551 SHA-1: 57921f3793fa763d147423221ddfa1080616f5b2 SHA-256: a8f04c4b24abbace19446139f66e3503bf8809e9cb64e82c29f40ad6f4d6e07b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents that leverage embedded links to achieve their objectives.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=how+to+make+pen+for+android PDF link annotation
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/xabofiremuwojofukeruseva.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/1112263183.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/99782352859.pdfIn PDF document text
    • http://vipdiler.ru/files/file/sejupipitebonurebag.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/c48ccadf1e077416d8885026a972de42/tugakanibipefexagexogiwa.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ogqbfae3i9gqn5s9cqflgmm5qs/lidimetujijetoveroxati.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109050729427867.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/93343305890.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/sitipake.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16148302cdbc0f---remewemimorofevifug.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/52af695ae25289cc6f027d51f2a198cc/51669355146.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/061820041041.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/1577700730.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cdeb350043---25769821484.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/lobeb.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/56504553914.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/76306864521.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16153a6f7325c8---39448616732.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144beeb3bb68---17233503244.pdfIn PDF document text
    • http://northcity.rs/slike/files/timezinarowemevugik.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/21515787215.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/9922835855.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/xupigemevubi.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • 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_off0000b32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3C 15112 bytes
SHA-256: e0822aaffb025d9ede66782904866b730a59b5625b3fd3b1a4a210c540a4cb2e
font_02_sfnt_off0000f156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF156 10616 bytes
SHA-256: 997fa36592c2d7a5bab3f907b4ac6ea13cf48c35e8c08547036933d9040c2b10