Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b84863e57ef61a…

MALICIOUS

PDF

89.5 KB Created: 2021-06-25 17:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d21d6e0fa758d3eafbe899f4001aa7b SHA-1: 205ae763a4adc0f76918f1a9d68bb210b382f1b3 SHA-256: 83b84863e57ef61a6789498ddd6c2a9cd5a0e45605b72de4b11e52993288b505
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it's designed to redirect users to malicious sites. The file's structure and numerous links indicate a link farm attack pattern, likely intended for phishing or malware distribution.

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://medvor.ru/uplcv?utm_term=order+of+the+rapture
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/9778f71df3ad4f5361ee247d7aa3c816/30481438532.pdf
    • http://podlahypilat.cz/admin/file/pulug.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a87839db6b4---86945727879.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/6cravam1g2nd3mliusc71a720g/65792959749.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b2368fa291c---bugakudefaz.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/44aaccha5g9alsqf9nkkqgpkr9/91921875738.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8a56d682a---79176939145.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609baaa3d7a6d---18614658646.pdf
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/zilezoverezugef.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160943fbbdad36---widonidixudezojifozelaw.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/rkj9erev22d729272asho8vnk3/fufopekitodufumazobifir.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf89b7ace6---wofavuwinopo.pdf
    • http://bmsorganica.com/userfiles/file/90896773458.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607805dfbdf99---67577434204.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/pj8gf4pdbtfgfhj7k4396d1lsh/samev.pdf
    • http://ypperfect.com/ckfinder/userfiles/files/bikubok.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c631d067f1c---sorijuxaruralabe.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/82kv5ih0qjdepo7u27ncijsgn4/74499948750.pdf
    • http://argyleliquidations.com/userfiles/files/nemebinopitomolave.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16097abf05c285---dipovuwuguv.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6c802b7a5---66778965195.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083280b5dc13---60058765614.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/87ae4150850f27045efee92e37a69db6/54581681932.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5822c7065---xonanizokagedenuzub.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcea.bin
7e12f8185b936f6bbaae9aa999f867a864cb12b2b17a7e5df082b25dcd3f7b70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEA 16976 bytes
font_01_sfnt_off00012942.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12942 16792 bytes
font_02_sfnt_off00014159.bin
3dc14af97f86b80ee3648a16f994ea1165f163a4ad8c20cb892b822fda11801b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14159 10308 bytes

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