Malicious PDF — malware analysis report

Static analysis result for SHA-256 34acd4aa7e187910…

MALICIOUS

PDF

70.4 KB Created: 2021-09-17 11:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 20d5add6fcf36c6f8cfdb812ef2f5e43 SHA-1: e75b2ad4ad464ab64c6f0608c047954ba49766c5 SHA-256: 34acd4aa7e187910007696d52b7b4e642e98e5e1c3a7bed719d618fea894673f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=what+to+eat+before+and+after+a+morning+workout PDF link annotation
    • http://cuspsurgeons.com/userfiles/file/31903130432.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/karufanefifu.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/marago.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161425c8a9ada2---13331577729.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/oukildtlvvh36a5lqpvt6h0rkb/dikevuxog.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/lomilek.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143eeb5c1329---vibozoxupuwogumud.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/42211700085.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/tikadix.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/noxunego.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/61006095526.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/21452976768.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/34930969964.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/92839846740.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/47802696723.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/fokimedebawone.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/kumutujanezadevijawavo.pdfIn PDF document text
    • https://spyboarcams.com/files/riguwoto.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1a968f159---fuwakuxen.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/106f50f3898c3abc0be51367ab1a158a/99929557485.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161371e54ee97b---sinutuxakaputironirojomuj.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/88414532501.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/472675570.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131ad9b2ef03---43514460929.pdfIn PDF document text
    • 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_off0000b547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB547 14976 bytes
SHA-256: 93aea4897151912bda5172bf668497e63ee27ad35e536ac1940a1f4f1040c507
font_01_sfnt_off0000dac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC7 10996 bytes
SHA-256: 85cf8b58c4093eecb53ea6c1f28d9bd2855fc2591803473e1e0d68b898da5aea
font_02_sfnt_off0000f3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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