Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af301a9b0364a6d…

MALICIOUS

PDF

68.0 KB Created: 2021-09-29 00:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 052a633cf10fc03d11dfb9f8b03270fd SHA-1: c47a0f2df0168d1c2d4682829fbbca1b7d47cc25 SHA-256: 0af301a9b0364a6d4e30bd7752df9bc46359d29172ea6cc5c5c2463d05cd0e20
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by an ML classifier and exhibits characteristics of a phishing lure, including being image-heavy with a click-outward action. It contains a link farm pointing to multiple compromised CMS upload locations and disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. No scripts were extracted, but the structure strongly implies a user-interaction-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://piphoto.tw/uploads/files/202109070827309951.pdf In PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/b017488082b6aa84e6bd4a1b9d74587c/57525364643.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/bixodubavofu.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/bamabijunedorajesor.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/25377836248.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/96462421948.pdfIn PDF document text
    • https://anjingliar.com/contents/files/35321049919.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/42793408043.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac4aacb85c---sigoku.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/tm9uohe371l47jodurcpj85i06/17102483630.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/7611662099.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/bixivofidowezupewib.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/pulovajosapu.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/kanobiwaka.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/pomomajowimejixeboka.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff61c07067---58803427766.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/kebadakuwedepip.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/pivololibife.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210914014408961002wg91eakernbp.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/wumijemonuje.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/25572233413.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48431496327.pdfIn PDF document text
    • https://thietbigas.net/media/files/18489102672.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/tirem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=words+beginning+with+suPDF 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_off0000af98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF98 14140 bytes
SHA-256: 9c5cfc64f2cd3bcb81bfe4c4eedc33e28155e03951460af1a0726ff591d9170f
font_01_sfnt_off0000d260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD260 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA77 10640 bytes
SHA-256: 02b26fe65bef1b2d5af519bd15e9f170157cfd39017c0138446d0629dbdbb550

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