Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ccb78ce095f677…

MALICIOUS

PDF

83.5 KB Created: 2021-08-01 06:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 38aab37a71ea71f321e2fdf8fd7cda49 SHA-1: c54c9b59c5e2b8cf4e66f476e3b2b32da0f9d027 SHA-256: f4ccb78ce095f67776373733c877f3833e2832fb3e9814441d4f46ec124d8316
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous distinct hosts, many of which are compromised CMS uploads or disposable domains, indicating a phishing or redirection scheme. ClamAV detection and ML classification confirm its malicious nature, likely serving as a lure to download further payloads or lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://sz-nuoyi.com/Upload/file/2021072410075247859.pdf In PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608227e0e8936---13816476468.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/c7b19f4f1cba9a2b47b390473948839b/9153981433.pdfIn PDF document text
    • http://geoman.cz/data/file/govajuxajoli.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0c9761031---60614707432.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fepibuxikoxo.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/91572155049.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/14944286213.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/28889467806.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/dd544966f575fdeabcab681396a7a907/sitejifotelevazajenejala.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1622655099.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/aht25o51f041952dat793i0hi5/kogijelo.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/bb4bc71d667c8256110b683dabac0bd0/nevikukakik.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608944b345561---makolas.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/97816830504.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3dd85d1b68---vexewaf.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2cdb98042---topuresenunuzutenajeres.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089e17210749---lekujewuber.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c9859324ee8---gixif.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/r90vgr7juucht4ffvvh8n938dj/niwobiz.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc887b65c5---39876013943.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16095e7fe6158b---lewevulokuxoloxigemirokab.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/12991103493.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/kijulemolubabujuzu.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/devefagagiluzawiza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=if+i+could+forget+him+i+would+lyricsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F2 16536 bytes
SHA-256: cfefb2f4d77f94774ed4a6acd7f3e0b0c9d2c03ffc184e9ffd8c0640385f04f8
font_01_sfnt_off0001049d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB4 10908 bytes
SHA-256: 962a9be4ce3da226b43044080c415abdbc482746f62f4623f248fa43219f5405
font_03_sfnt_off000135c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C3 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8

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