Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c73cceb131fbb22…

MALICIOUS

PDF

90.0 KB Created: 2021-09-18 16:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eb124758d785e06bde8ad7897558690d SHA-1: 51a3a251b6eab17fba87497b985504fd682b687b SHA-256: 2c73cceb131fbb22694c38ef0014d0e25093ad63273ef328b5cf4c0aa481d765
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://krisoc.ru/uplcv?utm_term=copy+my+data+apk+download PDF link annotation
    • http://orvositudasbazis.eu/images/upload/file/86192285085.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/90181526265.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/lapiviwof.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/59184542948.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/bafemozokomel.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/55794861054.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/tuxukipe.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/37807879895.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/62922900416.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/56984979377.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/83800935892.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/3a0e2c2920535728668fc0b51faeb285/38399373788.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/suzapopizibikokaxap.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/50957063482.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/reluvogoregig.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/81239893611.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109071056058325.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/79240039901.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/solek.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6e5bda7d4---36937210819.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/3846466594.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/5748233661.pdfIn PDF document text
    • https://togeltop.com/contents/files/mabobudexo.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/sexuworuku.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3bd2b70b8---nezogozifudagefedudikeli.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_off0000fa06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA06 10384 bytes
SHA-256: 23db417502ecbf48c1bf05d128dcf117f6fa2c87c4e597ef8a3d710bab04197a
font_01_sfnt_off00011196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11196 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A8 18928 bytes
SHA-256: 3f5835f00fe696a64c582f77fc38d8eea2d35ddca8b9ece3f57f64cc5e94a111

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