Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf6ce9097d371c89…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 19:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 805c73f89cbf7445c1a23f08425d93d1 SHA-1: a2de9f31bbcd9c1187bf47e8126c111c4e8b154d SHA-256: cf6ce9097d371c89ad841e78a11e31148095d8bca66b93f04cbacea07d8b0ee9
156 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of multiple compromised domains and a high ML score justifies the confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085f8c9d7f98---49808017635.pdf In PDF document text
    • http://learningkey.org/userfiles/16944208549.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/jevopon.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/fusezurukesopide.pdfIn PDF document text
    • https://selltoob.in/ci/userfiles/files/49555809506.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/mariwaduzarekeru.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/27228959377.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/sasig.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/49525064110.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/rm4k6ufh4jgi1ms45hma6b1lb4/12982864104.pdfIn PDF document text
    • http://guowangcable.com/d/files/xiguraxekif.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/13dcc40538a0cd7ff751ee9b7471385a/jatamijufefonufawab.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa0123d0d9---45146314963.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/11475123266.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4bc1e6a38---vigofomuzikubimasudiz.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611070a9409d0---pemeke.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607880a8b46b6---38922787944.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b809cad4b---dazifusumajapikizaxavezol.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/2085733445.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/lutegepanafobavaw.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/botabagup.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/rubanitenebetizamaseje.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/depomasijekirutimugo.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/mlms8e322n0f86f8b3lvoq93et/mulere.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/sudegimesofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=add+button+with+javascriptPDF 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_off0000dd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD25 17248 bytes
SHA-256: 20512e777ba2757e4ac7ae392a7bf43507bc24c02a296a8773600502437a98d3
font_01_sfnt_off00010987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10987 10936 bytes
SHA-256: c693c5bf169bce774c93cff4bd1bb7dd0fe9bfdd3c2d5c2349b513462864258a
font_02_sfnt_off000122a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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