Malicious PDF — malware analysis report

Static analysis result for SHA-256 aba291803466b194…

MALICIOUS

PDF

82.8 KB Created: 2021-08-18 15:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9300a6fa2431405c96fb4ad8bd54809e SHA-1: 5eafc3a302808ac44f3eee7def48fa101e63cb5e SHA-256: aba291803466b19420c6a661c901215d95f12edade12ac16e0a63798aacddba2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a social-engineering tactic, presenting a lure to install a browser extension or update. The presence of numerous links to compromised WordPress sites and disposable hosting suggests an attempt to distribute malicious content or phish for credentials. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://cructi.ru/uplcv?utm_term=can+you+return+a+part+to+autozone+without+a+receipt PDF link annotation
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8d55460a4---1424012547.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ecc7aa60e---wesujusidilezidomuvujaxu.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a9beef9223d---galurifilajobe.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a2c5c9794194bf100977e8338b58b2fd/kupobiputalofaxufin.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/zumalevomozujunuzaj.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/93b5c7a4298466196647eb0c8120b628/fiwokogibakuwelozejavir.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607a55d3901e6---xokipitadovepumogusawaz.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/72163153575.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/7293091705.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608270238102f---60259774941.pdfIn PDF document text
    • https://edarky.net/data/file/2336950471.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/95460163316.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/23409455704.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/15977805743.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/0383acd170f97ec0a904fd61414a202b/5567505432.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/76a1jlffnbq4oo9dhugj87p16t/pubagolevogoseduzokape.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe4ca508a4---38012282498.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/20559029469.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/zubajapuw.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/1464713524.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/11905346916.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f281ba2081---75880121476.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_off0000df09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF09 10648 bytes
SHA-256: 09886ffc1f72c10a95a0bc7b3d132a4502ded82a3ee2eeb78ee47bf902a05e6a
font_01_sfnt_off0000f780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF780 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F92 17256 bytes
SHA-256: ac9733e04c988c4e25fcbfd6947f15418e7190a2fb61e079f00aac5bf2c3cc75

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