Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c6901ce215c8960…

MALICIOUS

PDF

72.0 KB Created: 2021-09-09 14:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b4047ab8b4a3585f8d812f17e3f68b0d SHA-1: 2adf912ed50c4802756ea335a905e1acf478be93 SHA-256: 0c6901ce215c8960775e7d6eb4c24a3b3a3fa9e3b68ac9ed8020803f29407257
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users through a potentially spearphished document to a network of untrustworthy sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://kondicionery-shodnya.ru/upload_picture/file/85236373785.pdf In PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/d5sh7qthl7qh16p4ehk3mk71ad/13945507698.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/5995053116.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/vaxakozivunadizoliwi.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/14545460459.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/61022788068.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387a3de2755---busovajijitoj.pdfIn PDF document text
    • http://sung1.com/upload/files/48739908325.pdfIn PDF document text
    • http://dytac.hk/userfiles/21346709669.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/63936879532.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/vavuzevusawujami.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362edbbc99e---19768288427.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/61eac69d4b7420116538e877cf674221/midugidevodojojifadaja.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/67552909141.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/wigilikurutitexose.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/6e74a83b20370494a1d7129189fe5834/32772670307.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e7c4690e6---sotidufalamalibebaf.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/6899968853.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/negovagunubori.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137603fa7fba---10126834476.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/zesojututomekefovusizip.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/tamofuzu.pdfIn PDF document text
    • http://skia22.ru/pic/file/gorakabomizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=back+button+android+app+downloadPDF 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_off0000b79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB79B 16616 bytes
SHA-256: 5e2296e99f0d91268ab049ee2dc8b3e7b8d3e7c3bcfea42891249cc63d28eaa5
font_01_sfnt_off0000e1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C7 10676 bytes
SHA-256: e6e4ce38037eaf2c50466902f1ccf06cd270b7f58860491b2610259f92ca4acc
font_02_sfnt_off0000fa3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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