Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb4093f98f6ce399…

MALICIOUS

PDF

77.6 KB Created: 2021-09-05 21:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6927d462be1c237a95920913bfdc013e SHA-1: c3ba0eb3eaf9a23f487d3ba2d69121fd474ac963 SHA-256: fb4093f98f6ce39904446fd01911e145f1015f4efaec78ddca4329c2179b4b08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest an attempt to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://smidgel.ru/uplcv?utm_term=metaphors+and+similes+worksheet+free PDF link annotation
    • https://apsco.ly/userfiles/files/96561913744.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/zeloborekeretixa.pdfIn PDF document text
    • http://cpviettin.com/upload/files/korizunoxagoburaviravasuf.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/33ce8b7baa05966718788274eb24c6c4/71060936394.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/189de4530716331c7fda584ed9f5cc20/rabokiratososimuzaru.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/82630046422.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160916ded5392c---wirojaziwamimaxusomovuvef.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13240e90f4---65845372315.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/bolukutafowijaxerabuminep.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b95e2c207---35033248300.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/94106748718.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/955105103.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/kabomilelofivuzazezepe.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfa6380956---34434529720.pdfIn PDF document text
    • http://momsystem.ru/public/file/vopazibawox.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/lesafokezezejofadev.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/37470167243.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4ea2ac2dd---mumifoxevitarunemokakapi.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/lubebonitixutabo.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9de5a88f8f---mabosuxekizutimiloril.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/salegexelev.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_off0000cb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB61 10932 bytes
SHA-256: 9fee64b547601168db2890f69fd5562adfb5c4252be8910ed18799883fa2a15f
font_01_sfnt_off0000e48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA0 17040 bytes
SHA-256: 6bf7623331bf2ef054330cc6cec8046ac407f6d90fddf6bd28d349f07d939608

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