Malicious PDF — malware analysis report

Static analysis result for SHA-256 61173884a04d9a80…

MALICIOUS

PDF

94.6 KB Created: 2021-07-16 00:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: de4e709fa5bae81068faa95367a0312b SHA-1: 513c9194d86af792f41fe305c5637218c9f87ebd SHA-256: 61173884a04d9a80a0a925daa2390d324baeb2244768f212c66a460d52d89d05
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable domains, such as 'infrive.ru' and 'kennedy-jackson.com'. The presence of embedded URLs and the nature of the link farm suggest an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://infrive.ru/uplcv?utm_term=pf4%2B+lewis+structure PDF link annotation
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/37353478426.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/48246142283.pdfIn PDF document text
    • http://101balkon.ru/upload/files/94020100286.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/deribesaxorukagejer.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072a2d8e1ce5---rojemejoporuxenemi.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1e9892cd5---5338511720.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/mupoku.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/c93884cc12252d7e197e542cb50ea9f1/nazeripetodimebimifezox.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/rekasoririd.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083a468658ae---gozamuvut.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/d1bec085ba7ac0f995902daeaffe0a4d/visal.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbbbc205e1---80039201449.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707a4269445---59455597383.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/bevufadirawipidoviko.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960c82d2c5c---25810633005.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085150bbab19---zufatez.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-23/20210523124906444020.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/futowuridori.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/57885584404.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/tuxutusomafofiverakajijiw.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/sarotadunisimewobepu.pdfIn PDF document text
    • https://digireg.pl/upload/8413541571.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/8cff52d8c88eb1573abbd849c55bdc5d/xalesataw.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/42059180792.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/lojopasemebowelogotu.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/6eb1429270abbd9094a810e8165d7487/lipav.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_off00010d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9F 10208 bytes
SHA-256: 08737e29043c4c774874ae33beb4ec6c203072ba63cb2d5afe32bd73bc355ce5
font_01_sfnt_off000124c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C9 17836 bytes
SHA-256: e278341e5a72dc5e31c160a29986a4fae8864224e5a668398e576689bd2ad0c0
font_02_sfnt_off00015383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15383 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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