Malicious PDF — malware analysis report

Static analysis result for SHA-256 46c949bb6defeb5e…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 14:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 41befaab2e08c10067deb307eeea7b4c SHA-1: 5c78a5cfbea663dd3e1bddd6da87f6e8c0bd6fb9 SHA-256: 46c949bb6defeb5e5be783e69faea3860995cf7058172d3a6ce7198e3e52d5d0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable domains, a common tactic for distributing malicious content or phishing pages. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a method to bypass gateway security. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://gabident.pl/local/userfiles/file/86832604645.pdf In PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/lowev.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/87601561479.pdfIn PDF document text
    • http://fruitsad.pl/images/file/gepoxotun.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/77668331450.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16146ca2b7bc20---dizoseduwofonovoravebated.pdfIn PDF document text
    • http://feminella.ro/upload/fck/jikijibebev.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/pijiviwoka.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/51192735946.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/xinoromivedefobatimen.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135f1c2a875a---pemosebabameluwosuxed.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/53740476047.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/karit.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/22537211874.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/jeter.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/romozijajul.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/407058203987c2b10075bf0ae3791f3e/88846153862.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/kiwemofozekulanazujiv.pdfIn PDF document text
    • https://bem-sa.com/img/file/87770642065.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/75480704706.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/96707069270.pdfIn PDF document text
    • https://blogsma.com/files/36134834243.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/87097234954.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146e22bf198b---39890028161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+disable+safe+mode+on+android+phonePDF 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_off0000d5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E8 18004 bytes
SHA-256: c2585ba1428c63f12b9088ebf6bb383b85465b1b4813d1b3f60f33e9414fb3d1
font_01_sfnt_off0001043e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C55 10980 bytes
SHA-256: b71893576308981f0e6fa1235b9be95ef4a0efaefde26cf31be9096097ab2240

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