Malicious PDF — malware analysis report

Static analysis result for SHA-256 7984376f31de9be1…

MALICIOUS

PDF

87.2 KB Created: 2021-06-26 08:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a68c249698321c60e0b9d20568d626f SHA-1: f32ceef6e885230bdc99356e95b5620f54d69b8f SHA-256: 7984376f31de9be1a126f4c55f0182fbe0a9e47cbfb833863a1bccc115fd2585
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The presence of external URIs and link farm characteristics indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7bf773623---80949097102.pdf
    • http://iviltra.lt/images/files/redinu.pdf
    • https://sabagdasarov.ru/upload/file/25973702466.pdf
    • http://washchienluoc.com/upload/file/655265022.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a91d0ce6947---nevemidivolow.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/22092407914.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9b43de760---viwejez.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/d0a6bd2c5a8a110cc93a63e9c910595c/6883782139.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/2e7k8qi05qdsio242s4j7hc6g2/pimifisufu.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acdb9da061b---tesokafutukumo.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2469d5be3c3a062796670bba3b018eb4/lakuxafisugebu.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/0b3f9d94b98ad08d710db21a5e305357/bibinefepozapopakovawena.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/2efdd53f546ed34e21d05cb8c5ccf556/18462084505.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5fd04874a---romuvopikitux.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712f7a20af6---gokatamiwefodedoputebeli.pdf
    • http://traktorpulling.de/ablage/userfiles/files/namizorawetiwanukidatulol.pdf
    • http://pngroup.pl/ckfinder/userfiles/files/59172158592.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/jo74lifkqdholq2ojamnh5qnht/fabagororulodenigumakof.pdf
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/q1ieksade87q266s4ek5pcheh6/figifa.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/28d0024e84ffe24282dd54a57cc23ba9/34931453830.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/e647efd55db367d3b72e5116c66704e9/68541994316.pdf
    • http://ilovechardonnayhills.com/userimages/87009743893.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/e62030ddc1c408e32b2f6973a18928b5/18801807331.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc55d58da8c---zedavodiboregazer.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=5am+in+toronto
    • 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_off0000f44c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF44C 16792 bytes
font_01_sfnt_off00010c5e.bin
87a83e930bb8e20e5686b07af3298658203946ee6d78751fefa6004502f376c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5E 16948 bytes
font_02_sfnt_off0001386a.bin
3811faf0ebea921a940dd866aea15fba97d776562621081eb8b90f7e8942ab1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1386A 9960 bytes

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