Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a80ceb6aa926c21…

MALICIOUS

PDF

74.5 KB Created: 2021-09-01 03:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f2d99167df903a7353ebaa755ea7bd77 SHA-1: 8d59e1f8013a4d0d6f0c3de46dd996d48871545e SHA-256: 8a80ceb6aa926c216957d97daf211255307e67f846885be509049aa8c20b1077
156 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDFs hosted on compromised websites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c044d44e96a---jikezoromosapuda.pdf In PDF document text
    • https://alakharia.com/public_html/userfiles/file/27718845007.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/o6thiv6n0h2ft9cj48g6i26mtg/witekigesidavureliwimodux.pdfIn PDF document text
    • https://menu2uplus.com/images/file/50709336005.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/mekezenusilutidovudul.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/08/17/44451935416.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7870180b5---6093245888.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc97a3efe3---sedebewezexalapuw.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/joligi.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e976a3927---wijedeniwudazobuvapi.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/d4334d499739cf1d0d0606a668ed8ddd/98012132450.pdfIn PDF document text
    • http://topas.lt/userfiles/file/48330514116.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/96881463426.pdfIn PDF document text
    • http://4bx.pl/public/file/siwirelafiw.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/86458433602.pdfIn PDF document text
    • http://irths.com/upload_files/files/60649621043.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/23026136559.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/fejagidolirigozofu.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/50165498903.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9866d6f0b---81404119528.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/28911003807.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab01e6be86---matopufamajawagesexoropo.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/8fef22837d85419bb8387915964fb9b1/dasobobugeb.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/46280089412.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/womijowebog.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/33655420953.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=organic+compound+with+nitrogenPDF 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_off0000c3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE4 15208 bytes
SHA-256: d12e5512b52b61cf825f13f64548e46ce27dca0b7c94a35896a4c5298211b883
font_02_sfnt_off00010226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10226 10960 bytes
SHA-256: de1a2368c6879bb2398dc46da4d171384ecde6758a5662a7201cacfc5e5a678a

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