Malicious PDF — malware analysis report

Static analysis result for SHA-256 25796b7abe7aaefe…

MALICIOUS

PDF

70.1 KB Created: 2021-09-02 10:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f206addf489410fc0ca22174a9125dc1 SHA-1: f912b2e5e1210fab01be68273f149c37fc153f14 SHA-256: 25796b7abe7aaefe5a085d55e55314c046a66173e7696cae348ff586e478e6fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm patterns, indicating a redirection mechanism. Heuristics suggest these links point to compromised WordPress sites and disposable hosting, likely serving as a lure for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://krisoc.ru/uplcv?utm_term=148+cc+to+hp PDF link annotation
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160b00c748e9d3---baribedupatasirafurepivu.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608905feab8f9---wipaxabopesatawakunolo.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/f433c1e21b1af1321382a2f995676a78/ruboliw.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/c7e6dcp6hsdsbtb0jelcmo0v9h/gogemulusowofir.pdfIn PDF document text
    • http://charivne.info/images/file/37750688631.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/b4d3594a22a6c2170609a4fe2cb24225/63036138348.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/27008073322.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/75362546188.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/50490291554.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/0aa93ef22dc3e8e39d5768a088c7ef5d/kigijorevirazevunamivolez.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/515a5a0ca54ebda0d25da47832bbafc3/82449734928.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbea850e18---76818094288.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/nefimeruliwagiluvuvorodi.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16128e3d15c86f---ladezuvixaxaremanu.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/kuvasepugakazezejom.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/e8c80d246fb907bf4509cbda7f7c3306/kixigopukawexomur.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/fiburiwexi.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/deloxe.pdfIn PDF document text
    • http://exosushi.com/uploads/files/52959571393.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/532a73e58ad1464d7a7a794021e8d40c/90253209927.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/7244615789.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/70920438832.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c105001f4a4---85817826207.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_off0000b7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C2 9908 bytes
SHA-256: 49e93ff770a55ee0b4de719229c38e6e9f80c8fa2494e6daecac746b7cf793d4
font_01_sfnt_off0000cdcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DF 14444 bytes
SHA-256: 472190d55926e1a77d3db190eeb2d2640e5c28ef5a997d8da44543b3af60bf10

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