Malicious PDF — malware analysis report

Static analysis result for SHA-256 fded9b6ce04b3f2a…

MALICIOUS

PDF

85.5 KB Created: 2021-08-11 13:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0c3d2a1c3bc576f354ebd56b792f595a SHA-1: 188ac822ce43592a8bfe931b063d579638d4f1d8 SHA-256: fded9b6ce04b3f2adf626e12108b7f0f1683d87199c0ebfee15ad80a64e33b8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are common in spearphishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://archism.ru/uplcv?utm_term=skyrim+dragon+priest+locations PDF link annotation
    • https://synersys.fr/contenu/file/pepisusogufeniruba.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/goxek.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/nivofilepinefiz.pdfIn PDF document text
    • https://samudra99.com/contents//files/gisegaremupe.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/43275285680.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42c10149df---xigodewevimemoverupixumi.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/36279689269.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ca6a26a3a---14002169151.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767d9aeeb64---faxilogate.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/d0f7c54ae3c7b92dc9187af1e382fb23/6308776970.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/f1ff299081800f7f4769a69f870e5e7b/jador.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/pozesiwadozipitozopume.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608062bddad85---zivumivosunuta.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/22549310146.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/datal.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7e41a0f38---56781898518.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/58259899803.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/mudopujamedifezupuxu.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/gafazovexizo.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f409d89349---runugegutonidedopavepafok.pdfIn PDF document text
    • https://dm288.com/slicice/file/kadolikemoka.pdfIn PDF document text
    • http://fygl.net/uploads/file/300734219536.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_off0000e9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C8 17548 bytes
SHA-256: b462e2ee967658c057969e40482a1dff069db86e84cd06db5e79c10c2cf803c6
font_01_sfnt_off00011786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11786 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9D 11136 bytes
SHA-256: af7e0785938ec9264147dd477b2d7079be67a8b720d760fe204660b759842a19

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