Malicious PDF — malware analysis report

Static analysis result for SHA-256 da07540f1feb0e51…

MALICIOUS

PDF

91.4 KB Created: 2021-06-27 15:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 83555d4abc2f57dd1db659ed93447ee8 SHA-1: 79e4acde5ca1ce255b4f5f5692b417cd079014cd SHA-256: da07540f1feb0e5160eace4098de7790f3103941498144fc52f998bd9f70f63c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. Heuristics indicate these are likely disposable hosting and link farm patterns, suggesting an attempt to lure users to malicious destinations. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/8ece4a1c3fb68de47b4495df866d58c2/sadolujodun.pdf In PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607226f55d5c0---57204270548.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f60621c624---golozuboxatuvomuwidaz.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d484f0a0c---sevasoteserunu.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/75092808158.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/kop8dr31h7fhljuaftbd080p04/10824307199.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/e4f5269bbb7be9bb5c40d53e23a352ff/womipekasaboxa.pdfIn PDF document text
    • http://jump360.co/upload/files/20210622200854.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096af9d2af97---85620709868.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/97111299693.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/fosawo.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/926e8dcb10988b6652653683ecd21e9a/tepixado.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/88k70nmsiveovpbr5mhg0252dq/negejixizowuvujajafosurot.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbdcbf253d---74347565113.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/mozedaji.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d9d47751a---xiduraguga.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/12895511631.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/9d9f945dce03d33bd7ede78fef3956cd/43789298934.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/e301247bec7b597fca85a6e112bc82e6/ridulaku.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/zumegasisugabom.pdfIn PDF document text
    • http://goref.ru/files/file/2310585909.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/9c9f324a184d260a35a4e4b61d754d4c/86223977127.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=henrico+county+general+district+court+case+informationPDF 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_off0000fffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFB 17596 bytes
SHA-256: f05fd645d423e130059759121187a9d0de7f3d7660c8e86c84b9aca7ea046515
font_01_sfnt_off00012e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A2 11024 bytes
SHA-256: 6c56255552f086fb49804fd0befe3afb4552563fc2db18c795a38522411963d9

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