Malicious PDF — malware analysis report

Static analysis result for SHA-256 1823a644caef80aa…

MALICIOUS

PDF

75.9 KB Created: 2021-09-01 20:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bfffae640e9610d3656b179b829bdadc SHA-1: 0ab8e60923c4998eed574a0bd79faeba9e47f482 SHA-256: 1823a644caef80aa0abf90e7b3c02dd9d1a9771e90801faa0336cf88803b91fb
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress upload directories and other disposable hosting. This behavior is characteristic of a link farm designed to redirect users to malicious sites for phishing or malware delivery. ClamAV and ML classifiers also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c5b17aa66---97624336152.pdf In PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__60DEAB361F607.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/vudawolabogojopapubudaz.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115dfa77c52c---27947787663.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/a7d852c1fee45947658ae3f1fdc6c2ed/mawoju.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/lomavo.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/rhnujf3amf4oumena1u7l6mrjr/fufowujumi.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/4835005308.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/3f077ba2ede9cc70d8be80c734d3427a/kowesexebegirolutasel.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/96049792763.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/rinaralelifa.pdfIn PDF document text
    • https://reniuved.it/file/ruzaterapusow.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/51670737545.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/36292043607.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/novesenevidumojogi.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/26377120872.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b54fe7d5ea8---wetunulikoxigopixetox.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832acddb63a---4128956300.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d297177f6cf---45985810734.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/29171680810.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/modikazotawafegotufukiwab.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/9pgqopm1fpmdue289t73use7c1/zawifetunadok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=do+months+need+to+be+capitalizedPDF link annotation
    • 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_off0000c448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC448 10880 bytes
SHA-256: 95eff0ee567851a9cd2d241177e6d28e26db534802ac4d799ba39ab47a8b85d1
font_01_sfnt_off0000dd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF512 17256 bytes
SHA-256: b9e6e5c19b4289777e8392eccdb0e1d5777fc12383e5f5da09ba6e22f36440af

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