Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e1995b85dae8eab…

MALICIOUS

PDF

82.2 KB Created: 2021-10-24 02:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: aba2e90dfce0e6fb01b00bd572006491 SHA-1: 6dbe995158c6cf4d23b97909a3eff1a682ae5562 SHA-256: 2e1995b85dae8eab329927a6b6570274b36ecfb6c1c616e5c8dca65fa8a272eb
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm. The URLs extracted point to various domains, some of which are hosted on compromised CMS platforms, suggesting a phishing or malicious redirection scheme. The PDF structure and link farm behavior are consistent with attempts to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=compress+pictures+in+powerpoint PDF link annotation
    • http://gruppocaminiti.it/userfiles/files/59213149751.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/kezenusexevagetoxivorisi.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/resenigelekidad.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/68320866099.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/87094008901.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/somiweritovul.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/tegevigadalom.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/58016007940.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/zojowefatorejonab.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/35268470174.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1616f0e4695bf0---xulowaxifujoxobati.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/26482454270.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/tizexalawiduz.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa73aaf01c---budinikod.pdfIn PDF document text
    • http://protok.pro/upload/files/15445076813.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/vudugogitidewakozigusiwi.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/2518512069.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161599ff04e330---zuxotuwilil.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/gofijetogidejipejaw.pdfIn PDF document text
    • https://gilbertems.com/videos/file/renasoxumejase.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/jiwufejesuxafis.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/bitit.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/82133199456.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b2387b0681a17b532e37e9429d2a0c4e/wutimameviwajax.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615344c49f1ce---50464207160.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_off0000db21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF338 10544 bytes
SHA-256: 08ce973bc71471715f0300047f893b2fbbad01208497f193f2e234fe67efc78e
font_02_sfnt_off00010b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B56 18272 bytes
SHA-256: 85d02489f7c5ad4c9f5d304ecf688605c405a607b172051eda810cc5425d42da

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