Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a6cc4517555a84…

MALICIOUS

PDF

69.3 KB Created: 2021-06-23 10:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 34c87d5c95aa7c2c16a1c78411505168 SHA-1: 13a7a86a274858c546af79d28e11791d918d6a77 SHA-256: 35a6cc4517555a84cbb0857fd3b5f183e3c4a7a973f6056b4c6c135e129ea6a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to compromised websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The document body, though heavily obfuscated, suggests a lure related to 'medical etymologies' to entice users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://archism.ru/uplcv?utm_term=diccionario+de+etimologias+medicas+pdf PDF link annotation
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160d28099811c8---nudilasug.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/d861fee6f20ba1951c507a1098dcdb9d/17579865001.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd1ff5f582---petakijanexoruwova.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/esvegrh109ouput08j7tddro56/wowolenu.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea353d05a3---pukalisutunuv.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/21028659349.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/q5bqt0f0ue9sijmt5mumo5q896/62681131921.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/41454485286.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210613132725.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/fumubexakedowivobepun.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160765f303edd4---jarukevepuvogebunukis.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/degikukoguremipedufo.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/a54ab088da2526de347b44975d4e4c6e/87025580797.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/346b87990f52bda5ea31ec3f47b9d644/nogutesojefuratupojikusok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD52 5476 bytes
SHA-256: 6a0edaef5672759e7c559b2663102fd9a93e442b857de244912810aeed32e299
font_01_sfnt_off0000dfe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE2 11976 bytes
SHA-256: c8d85d2140aac54135911d0bb1616b4234ea8921c9a0976ac5e162b4687b0c0f

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