Malicious PDF — malware analysis report

Static analysis result for SHA-256 be27afb5e1667cbf…

MALICIOUS

PDF

80.8 KB Created: 2021-09-06 10:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2134704c4b18fa12878e60ea93bf49a4 SHA-1: 955bcf5fe6c90e8744ce21d41d379a73360cee1f SHA-256: be27afb5e1667cbfe2d20f6e6edd25cf816784f467d1110b77de0299b2ee11ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage, indicating an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160949b4da5da3---jimegulow.pdf In PDF document text
    • https://suncables.co/images/file/pomikemukuxozimunosuwu.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/7jfbm6st5e6cf0fuve79bq38aj/zoxenamisobexisozip.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a79e2c0fd27---vetodovadurusuwiji.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130c810e896b---33940025316.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/31099606481.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/nadosuzumugatakagu.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/kimojuwesakotoziva.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/zepew.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/2b4a8c2b46eac26a30deccc65d9b114b/mupikiwejetibuvora.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/9e7183b4e191ee51ef9e73e8e051ee50/60685681958.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/budarasix.pdfIn PDF document text
    • http://imoroz.by/upload/file/jemikikoxunekinugirerow.pdfIn PDF document text
    • https://aashianarealty.com/file/vejadogepinotin.pdfIn PDF document text
    • http://lecostationery.com/files/file/kipajib.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/polaaa97j5b5lb3gl9ronq2q4s/muvawudivini.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/vilagizetuzizekavavuvodu.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084408b8d8f2---2514103594.pdfIn PDF document text
    • http://abwrva.com/uploads/files/weluvewexeviwopok.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8b28dbdd9---goxalibig.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/wusipixorukoworobalupoj.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160820cd224ee9---33684925411.pdfIn PDF document text
    • http://veitali.com/upload/files/lapavalarazajuzewilu.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/ponifoxaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=dnd+5e+gunslinger+pdfPDF 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_off0000d98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98A 17272 bytes
SHA-256: 689353dd5ec55ec1751a17d62379b51dccf2a147ecd9b28b4dbc70f54354a933
font_01_sfnt_off00010631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10631 10528 bytes
SHA-256: 942967d759ddf3d539d6b5337b5dbc72540093f16ae0a439026353d70b386cf7
font_02_sfnt_off00011e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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