Malicious PDF — malware analysis report

Static analysis result for SHA-256 deffb243a1e68f18…

MALICIOUS

PDF

81.7 KB Created: 2021-09-07 05:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ea7605202a8449f374bc1fafee0c008b SHA-1: 6e8c9f39c11b57d4d9c202afb9868ea871fda637 SHA-256: deffb243a1e68f18992f0a4f29b6e7ca4225032cf928b4b7edce8523236fc16d
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links pointing to compromised websites, suggesting a redirection or phishing scheme. The PDF structure and embedded links are indicative of a tactic to host malicious content on legitimate but compromised domains.

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://catamma.ru/uplcv?utm_term=texto+argumentativo+y+expositivo+pdf PDF link annotation
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f313cedc649---paxonadetuwedib.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/74883340113.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/tukofomulirunixepakelez.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/4695599696.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/naxokip.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/gesawonulajamajize.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/6e684b0b0e73302052dd218c6dda2020/5726583855.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/fijukukikupexukizip.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/ripudalabinodup.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/zovijojukajevomuvegikazi.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160de9f326206c---givivarizokeforudokaz.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b768b1d177---tukupudafawofajofirubun.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/fumozonuxejukevabirapogu.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/93172234741.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/warifefipapanav.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b284437f5e---merelejepenipavobuzuwu.pdfIn PDF document text
    • https://areicon.com/images/file/48697079280.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/vutezazativafiwuxidisi.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/5f6b13b1d2555ec2a3a0b967e4015cfa/52035922340.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/a638c2945fb4aca505d926810bbd0e72/82504443196.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/mevemubefexelemobu.pdfIn PDF document text
    • https://quaint-house.com/images/blog//file/wakaki.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/foluvefigeberub.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/11223695739.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_off0000d890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD890 18168 bytes
SHA-256: 11428509a38fd002837df1fd0e144ab7fc7c7e3720ecef5b827e6711e7ea227a
font_01_sfnt_off000106a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBC 11140 bytes
SHA-256: 5abc522fb970c91744627313d6e6542ed4c03fef7fc0cb022fc92e84da2b2330

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