Malicious PDF — malware analysis report

Static analysis result for SHA-256 db9c8274f83cd36b…

MALICIOUS

PDF

77.5 KB Created: 2021-09-13 11:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab899145e4ed51773a7a9715a52a1777 SHA-1: 5e11be89c5ad6e18723b90e0848159e73126c705 SHA-256: db9c8274f83cd36b72df68d47cb44108b3a190baaba345fb04d920677f9bb607
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as a malicious advance-fee scam lure. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to phishing or scam pages. The ML classifier strongly supports the malicious verdict, and the heuristic firings confirm the presence of scam-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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=cast+chrome+browser+from+android+phone
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b044b01b3d---bafifefuxaremarana.pdf
    • http://chemicalengineers.ie/images/33467848109.pdf
    • https://podiummagazinenews.com/ckfinder/userfiles/files/84841333509.pdf
    • http://misosmile.com/upload/editor/files/18043577490.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352165d22a0---39399924930.pdf
    • http://duythuc-bearing.vn/uploads/userfiles/file/18903931498.pdf
    • http://wowbond.com/upload/Fckeditor/file/80592252113.pdf
    • http://swvocal.com/data/se2/file/49379542757.pdf
    • http://cancunday.com/travela/img/files/51280391746.pdf
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84101508133.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/2291faa007ebc6906a0bf65257ce5555/powaroduselugifasasanema.pdf
    • https://tepatsasaran.com/contents/files/68628248218.pdf
    • http://sicilalluminio.it/userfiles/files/tokoro.pdf
    • http://goksirkrupskimlyn.pl/img/upload/files/duvogemokugozizaxo.pdf
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/87785368834.pdf
    • https://didacostruzioni.it/userfiles/file/lesevidubelozofonasamol.pdf
    • http://suchanekstomatolog.pl/files/file/7086517154.pdf
    • http://iviltra.lt/images/files/77121340891.pdf
    • http://naturpix.ch/cmsimages/file/68868154071.pdf
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/vapuwasajimubabomos.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c914.bin
eaa8b9970d573ecab0ea0ac59d2da09639e4a57f255bb3964cf6e0b2369a34de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC914 11096 bytes
font_01_sfnt_off0000e2aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AA 16792 bytes
font_02_sfnt_off0000fabc.bin
3959530b05bccdca296a1da7f771927a1026d7932635d60701b3d69b8b8e14fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFABC 17508 bytes

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