Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b157f7e20a97a6d…

MALICIOUS

PDF

82.3 KB Created: 2021-08-30 13:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7aba9c2c23fcf182aff49b9b1ccfc27f SHA-1: 848c92c1f3b8f198633bed5a9007a7b9ca221b6d SHA-256: 8b157f7e20a97a6dbacd22ad68a9f9f5c3d0ce6f9ca777d44dc1873376705aab
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to potentially compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded content indicate it's likely part of a phishing or malware distribution campaign, possibly leveraging a PDF exploit or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/gekagadapakilul.pdf In PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/papol.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/mujapagefa.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/68123268075.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/telulelu.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mevumutotozuzisebi.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/dipame.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120f09eed8c8---44216694979.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ladojomisufojokiv.pdfIn PDF document text
    • http://lg-palette.com/upload/files/64432532872.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/31503049926.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce56d533cd---nukezabagivi.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/wijowazuseminep.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16071391e1d28b---jotetamiguridelugut.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/5502418473.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/66474442791.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210810110531.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/ragorobidatu.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8dd383ba0---40030780995.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/jawajitopug.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/e610fpivvm61duo2d1ahkqdqh1/72036102308.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///ponemubobanulexaluvoziwu.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/kotededakixijolepi.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/zulesavepavi.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/pvjb56m1aff77m4kqbbmjjvmuh/97324150352.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/87281448400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=non+current+liabilities+and+current+liabilitiesPDF 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_off0000de34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64B 10580 bytes
SHA-256: 45d272d052114c9e625a2f133c87eefa08b0af719fdd98f5cc1e75b9ba2b18f4
font_02_sfnt_off00010e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E85 16932 bytes
SHA-256: 2a9b0d1e1d17bfc4d3660cc7064e53f85c56c90cb9534bbe51132c4e075a0d83

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