Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4354a37b4230b53…

MALICIOUS

PDF

75.9 KB Created: 2021-09-07 11:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b5ac4107d9199b1d20484424b5f22c6c SHA-1: 51993b516acb65e8286bb27812dba07c39c095ee SHA-256: a4354a37b4230b53ec4c2743a6289bf7e955e22638f3d501b36fbe92b27e33f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pixomot.ru/uplcv?utm_term=shorthand+dictionary+pdf+free+download PDF link annotation
    • http://www.w.radeton.cz/ckfinder/userfiles/files/870036864.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/4a4d187604c236b20e8532f32d0c309e/narosolexobagegami.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/92837536001.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/puxenitaxugujakajof.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/89069415650.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/b8071a5f1d4326aac4c826315d89fc09/86581476419.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/7dee1940edde384223970e28176d827b/pomuzatozife.pdfIn PDF document text
    • http://jar-ted.pl/file/6716076855.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/ed713041d33ff9874aa7a39ec0964db1/42037101091.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/o1vv9d2cb6hhqn0fja5dbt66s4/17700779115.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/pataxipupowiromesapajolem.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/bisosatudo.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/rcdcb6k3gadlrdfmj1b62e4ri3/wesumagevoratike.pdfIn PDF document text
    • https://corghialberti.it/file/nuteb.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082860cbc203---xubudejabetunitafixow.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/de4260d018082e6b6ae657f89bd882ee/sejepeberunadojumatijopa.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9fb1aa0cd---veselenogutitosaza.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/64675799066.pdfIn PDF document text
    • https://safecampus.in/cmsCart//upload/file/kenaze.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/5690695669.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/82902426153.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160accd4b78b64---15558092793.pdfIn PDF document text
    • https://airshow-bg.com/file/40028284807.pdfIn 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_off0000c426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC426 17268 bytes
SHA-256: 03f48c674e7f5fb5d6ed7b826dceaf9d432d8b75643a12e038356e7b758184d1
font_01_sfnt_off0000f0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D2 10824 bytes
SHA-256: f7a962ed58ea1f36465c4eedcf727403d03b9270e23971bccddaa7217f6d5d07

Open this report in the interactive analyzer, or submit your own file for analysis.