Malicious PDF — malware analysis report

Static analysis result for SHA-256 8afef22256975177…

MALICIOUS

PDF

87.1 KB Created: 2021-09-06 04:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a24ae81a452b6e896f12618ec1ceb293 SHA-1: 1753f03f33c02a7b7e0780dfafccab5caf898bd5 SHA-256: 8afef22256975177ef45057b566f6711e4821e5b674d49fb48baf22ae9258031
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The primary function appears to be directing users to external sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/kibopezirenew.pdf In PDF document text
    • http://arebiatours.com/uploads/files/makovusum.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/51515153250.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/65604340886.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/61cd0a2c2595dbeade3527a15b7a3515/95937977276.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/12256926160.pdfIn PDF document text
    • http://0930actress.com/files/files/xunep.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/0o7cinkdhng34da5q91etfbij7/jomulawamosizetufujavakub.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/23357832988.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ce4101947---56940153256.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/90600635154.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/zorureziguvixutevo.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e6d8b7dd5---pikuxamuvonezenolir.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611a79d2dc4c8---nopefutifofugevirariw.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/fubodeperizimadikon.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb3bba8e29---wusin.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/564f33085816995e5da06aa956d66862/namigoriroj.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/82649113059.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f3b0151584d---91943202920.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/5c29bb79b37ff062bcb48991fc6c9550/25866438411.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/2466847086.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/xomaxazukaxolotonarap.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/61575759252.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=crisis+psicologica+pdfPDF 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_off0000f065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF065 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10877 18096 bytes
SHA-256: 45ffdc18117c9ceb98267bffdde741c0eecf623d95568da6bf0f5a35baae6d00
font_02_sfnt_off00013772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13772 10492 bytes
SHA-256: 62ca78e88ba2910083f3b9851b5e51cb0f1f99199957a8445ab88709bed10769

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