Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec0f8ef51f17d42a…

MALICIOUS

PDF

89.4 KB Created: 2021-07-02 14:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 545b7a085f1c2fe3e4a8438f719026d4 SHA-1: 60ed20c7529aecbfa3effc7f80dd9439d3e72062 SHA-256: ec0f8ef51f17d42afe9a012af2cabe87e78a8c79fb49507a7b77691dd1b8d297
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=pregabalin+extended+release+tablets+82.5+mg PDF link annotation
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076156042a70---65151152461.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/1fe24a7f4bbf220d16ca474c9c090d22/zovafonisinoxupumenuv.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a3f5a1fff---kujiredemidag.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/m8vnmdap4gqm9ik291uagdrpeh/57789351620.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/83488907306.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/59604564883.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/f7f94843282025cce6c43394f85def89/92938502849.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/e9fd80e1b548e94f9f956c292e988dcf/rukuwidelevasofi.pdfIn PDF document text
    • https://clubsportedinburgh.org/userfiles/files/vavugiwukupad.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9df12c1fe---pokobaro.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8810354f5---22994182020.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608240bb929c9---12588554736.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/vovusugap.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/16f7cfe7148637baa35da551edccdf6d/20352064404.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dca2144b50c---31507036944.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/72688115986.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/160157929609bb03d0a6a8.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/5234fc8f0e49a82897525384ee69dec5/mudusivanufidavike.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/2f513f1dc565ebd31e2010d1ac18e7ec/jarijobegizufuse.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/b98d2c0df6fee00621163e293bfe1812/92114994116.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070aff5e144c---lexodujonitekora.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0338d0293---33874312514.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/daf32a51c1b3f10270c95fd740868824/14062787993.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/dt5efe78cmbq0d6jtnks9sbre7/9584683621.pdfIn PDF document text
    • http://labeling.pfizer.com/ShoIn 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_off0000f89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89B 17072 bytes
SHA-256: 56570eeca77070d37a4e818803d6f6aa31954def13d59628d233cd00827f4a73
font_01_sfnt_off0001257b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257B 11244 bytes
SHA-256: 6f6f32ea4ee9d19f16612ac80ab0a946ca8ec08538eab7edca9eee96e13591bf
font_02_sfnt_off00013fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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