Malicious PDF — malware analysis report

Static analysis result for SHA-256 867554a80cbcff52…

MALICIOUS

PDF

85.8 KB Created: 2021-06-28 04:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b359c199223fa9628ac4e4f83c01dd83 SHA-1: 964ae168e256ff4a6edd41f454c718218d0aa605 SHA-256: 867554a80cbcff524488620ce89baee7d9aead0cc5acc094e7a101c2be03c05f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and numerous external links align with techniques used to lure victims into downloading further payloads or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=interconnectedness+in+a+sentence PDF link annotation
    • http://nhasachnguyenvancu.com/Images_upload/files/75280499630.pdfIn PDF document text
    • http://soles2walk.cz/data/file/seliperuzejuno.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/12424319977.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b704a38858f---kedopixapolaxowepi.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/f09inurpp7rr93p79id35tl6oj/vodixelina.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/32933947177.pdfIn PDF document text
    • https://designclarf.it/file/92483029569.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/pobukatimuligepovesos.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/ad49d4240fca034a603e15b90a29d609/18305722308.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775e8ed3177---bebuvifiseguriwi.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf86dd5904---desilom.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2795947c3---67276063966.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e7cc2785d---67085075024.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/977ab6d4a7e302c30388b1ab5ffbd4aa/63021303674.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/3d19970bdeb32e3e6ac96f5ead493117/39756281946.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/6d3ac54fd1cca4e207105cfdf3329af8/gudegomofubexaponabevez.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607369f3d63fe---vojibewujojibozi.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/f393ec000621753c134dcc5123d93f69/duvupigukosuvuji.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607006be712af---rekuxeramesugugip.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/rewizukoxasizixonezegikor.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084f7b06f16e---fubesovu.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/b3b9dfcfcd8f4a19d7a452015593bb94/93118117101.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/zojewavorezujirikezisixab.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/81224421597.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_off0000f26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A85 10268 bytes
SHA-256: 4e28d29e719fa29e6d977a717b44a9bf0c05539783351f239bee3ec5367685a1
font_02_sfnt_off000121c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C0 15672 bytes
SHA-256: 22237deb961141bbed2ae02236e8c04aaa4461a40e58a23dc72e032d350593b3

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