Malicious PDF — malware analysis report

Static analysis result for SHA-256 add35ce92e18fe46…

MALICIOUS

PDF

81.9 KB Created: 2021-08-02 00:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c9342cc276e141c7a74c5f471e4be611 SHA-1: 6c5ad18017e681d698503435ebd3857482bc537d SHA-256: add35ce92e18fe46e84c206499145d03a792e7d43acc159bd31601f6d1b525ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to phishing or malware distribution sites. The presence of external URIs and link farm heuristics indicates a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/28955241451.pdf In PDF document text
    • https://basisangka.com/contents//files/lufodozelatubusaxoz.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9c923d224---jazuwilovokusakumubub.pdfIn PDF document text
    • https://parc-hotel.info/file/32595330095.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/81469482111.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608620384c099---towuwiwasin.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/56073703610.pdfIn PDF document text
    • https://vieclamit24h.net/upload/files/93569754254.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/1f739637bd71b546698a6a5acc5955e2/witoduzulaxeredemuluzawiz.pdfIn PDF document text
    • http://bscartridge.com/pic/bujupak.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/19df34a6b83ae73eff9bccc36193ea02/18633439941.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/70908283351.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0eaadd4c2---kivavimiguzatamutet.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/gomulegogesotakimerilug.pdfIn PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/xefowoliramawi.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088782dabf08---79752250732.pdfIn PDF document text
    • https://pendekaremas.com/contents//files/xidunarunebapaxapurul.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/ee97233a98fa5d41bcc17e655b959e45/gelawexumapakeparikar.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098d423751f9---29227479260.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/18375085240.pdfIn PDF document text
    • http://jump360.co/upload/files/20210609082137.pdfIn PDF document text
    • https://comfort8889.com/upload/files/2808320740.pdfIn PDF document text
    • http://vtaky.sk/media/file/vetemitaxosuniferag.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/wadalunisananozapuxudiso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=perimetro+area+y+volumen+de+figuras+geometricas+pdfPDF 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_off0000d7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B0 17428 bytes
SHA-256: f3571f40a3a0fcce01b455c16254516ad27efadfad03517002ba37a5bd5615f2
font_01_sfnt_off00010405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10405 11244 bytes
SHA-256: 14db0e375f44cbe3be4fe6b70d89c819744600ca8066ca786d30e322f813adcf
font_02_sfnt_off00011e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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