Malicious PDF — malware analysis report

Static analysis result for SHA-256 26cee5000dae10f0…

MALICIOUS

PDF

71.7 KB Created: 2021-09-04 05:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a0a7ab4351f7e708250213322974f41c SHA-1: 8e5ddeef8c0ed2346666667d44d9629e8d42584d SHA-256: 26cee5000dae10f0fe501eec22f1fd49ae080556426efe876b77a0c49801a527
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing a trojan. No scripts were extracted, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the primary goal is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=download+pdf+reader+for+windows+10+pro PDF link annotation
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/12029182602.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/porelepunuxewuxabov.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/e69833cc743435a76fd2dded32869da5/zosafisaxu.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca07880f66---wekolejenakinutol.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/nojak.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/17d9ee7a195ab08ec105e47c02a27ca0/xusasa.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/migulawuvetisajok.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c58e92cb5ee---gezeloxorumobipatako.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/pisuralaberofaxaw.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/pb3ijj4skcsunl8e4aoo9rojc7/35686992100.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/19755914038.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd42b1e8864---56036491023.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b969d3a5b3f---polupabemagiwanif.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609544acc63d5---zolexafarufedixotuwatodem.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/28778747958.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b3c7a71fd16---8586781359.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ffb83dade---30180954429.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/edhtqgca10pbbt0llq7vje28v6/53856025859.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df55f47cd32---14129086036.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cb143153f---fekugeto.pdfIn PDF document text
    • http://strandedtattoo.net/file/96654743225.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/resowusunolexaxagil.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/musowevakelipetowazifixid.pdfIn PDF document text
    • https://vieclambaohiem24h.com/upload/files/47866626822.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_off0000bb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31F 14880 bytes
SHA-256: fce474cf003bf00dc32c5a5e1bd6766c83641b45d8c92cfc7ff654e50f4a1f3a
font_02_sfnt_off0000f84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84D 10652 bytes
SHA-256: 30c63c8daa622aa1d096f067f34ffb9797e55049e6139d25b83a7a7c2d6f8b1d

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