Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cc4d3149e715892…

MALICIOUS

PDF

83.1 KB Created: 2021-08-18 00:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7dc07cd53b32f71d3f50a3095d0f9f81 SHA-1: 0e4c2e257c84ca47a513c4d9957a7c309276aef3 SHA-256: 9cc4d3149e715892f386db5b5f04edf28e7ba27ee053012bb49059a57a0063fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains a link farm with numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URIs and the overall structure indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://cructi.ru/uplcv?utm_term=air+fryer+recipes+gluten+free+vegetarian
    • https://self-storage.sg/images/uploadedimages/file/pujujaj.pdf
    • http://cka-shiba.com/ckfinder/userfiles/files/76176089006.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8d0eb459f---bemijifomabu.pdf
    • http://venusland.vn/app/webroot/img/files/64588034898.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752a4b75309---52077780454.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d114c8e6c---nolelisilud.pdf
    • http://www.uc-kushiro.net/images/library//File/zijokezenavulozijidusek.pdf
    • http://octapus.vn/images/uploads/files/biretukupuzozedeko.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/950e51a908d9edd4bf8c8c49ec6616f6/46647196740.pdf
    • http://salsainkonstanz.de/media/files/temikusofixejemime.pdf
    • http://biosafety.biz/ckfinder/userfiles/files/newiseka.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bae92d422bd---39248555372.pdf
    • http://beamstraffic.ae/amb/userfiles/file/64010657509.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16091a21ac7c06---82756383310.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16092413f1cbf1---335863565.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160a1979a7390b---bugigevatikuforu.pdf
    • http://buyyoutubecomments.com/ci/userfiles/files/99273863776.pdf
    • https://brakos.it/file/25795470421.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608f648f1a375---wovawigosotav.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bfca9a07e00---80134753980.pdf
    • http://usagimatur.com/files/others/24839322708.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773bd379e76---batefevixov.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078921750d6b---3389334421.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfb5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB5 16792 bytes
font_01_sfnt_off0000f7cc.bin
850b4d3465b41f9b11664c4c8cc5e9cd2022be871df2c961e54721a5cf38c102
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CC 10796 bytes
font_02_sfnt_off000110df.bin
781295636ce85f1a1dc7b9a40c09ac9ca029c5313d8272f8c4f2926e73129641
pdf-font-stream PDF embedded font (sfnt) at offset 0x110DF 17304 bytes