Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf9e6b20604d837…

MALICIOUS

PDF

97.1 KB Created: 2021-09-05 05:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 17bbff668dd34e64cf671fbce10a6198 SHA-1: 51ff7de2282ed48b89f3b37ac9b1fbaaf8d46b97 SHA-256: adf9e6b20604d837a1f9a772a571dda64ab3ef406442bda471c2d1ec17575c0c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs that point to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious intent. The primary goal appears to be directing users to potentially malicious content hosted on these compromised domains.

Machine Learning

  • Nyx PDF Classifier clean score 0.2227

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://medvor.ru/uplcv?utm_term=the+awakening+and+selected+short+stories+by+kate+chopin+pdf PDF link annotation
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/ns6d0nctl0l35ueo2l31bdg2c4/54513305888.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c57fdba6576---37796014064.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/cfafig2t70j00khfcb78trvc35/vafilen.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/surabosatojamivuruvero.pdfIn PDF document text
    • http://watsonwilliamsreunion.com/clients/82103/File/62215816711.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bdb626a4c---4843694457.pdfIn PDF document text
    • http://transsnabstroy.com/userfiles/file/mebusaxerulapabitir.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a85a47bbb2e---rigovujepozanuresazibog.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/zarovalijasupegiw.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/topuzebavepuvafenoki.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/85709938322.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109032007409200.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16081811eb401a---79205444568.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/54048701094.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b3916b665---98362970675.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d48ed6e2f3---32389367545.pdfIn PDF document text
    • https://tavio.ru/files/file/gemoxiwowerixomoraj.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/xurezuxotu.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/35372017400.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/gogil.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/81962941168.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/11045447218.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/3bf41d90078dfdb916214f6d90b57532/debik.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/cc86eca104cd1c194761cf7be1c7e009/xevosejen.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac75975d092---kawuduzu.pdfIn 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_off0001190c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13123 11296 bytes
SHA-256: 68583a19fd17d4c1a8918d47de72e5d75a76cff6b4973667a62e7f41d8c1acf7
font_02_sfnt_off00014b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B46 20340 bytes
SHA-256: 06944a8c41d51e18cf2a9b320210b9601955938365ac3ca8ba59a0e76c6046ba

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