Malicious PDF — malware analysis report

Static analysis result for SHA-256 281eb2a1090fa8ba…

MALICIOUS

PDF

91.3 KB Created: 2021-06-30 05:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 981988c7464aee763ed96d361b4264e1 SHA-1: d5ce9dcbcf45a9197f2bb92fe32343164e7f8e2c SHA-256: 281eb2a1090fa8ba8deed25f18be845e4a7c31a52bdf9a23b35e09316ff86185
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://huntic.ru/uplcv?utm_term=beautiful+places+to+visit+in+the+world
    • http://chretkinia.pl/userfiles/file/39493103128.pdf
    • https://ikima.fr/uploads/file/30867432443.pdf
    • https://biogenetixpharma.com/ci/userfiles/files/ninesonavawejonawiba.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/qpaks564hclgq1j9e7unvubmk4/77349423523.pdf
    • http://tfforming.ru/d/files/vogupodixugoravubesudud.pdf
    • https://capitalsyndic.com/userfiles/file/33197756594.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/567eb4e3de0ceb7f8d94c7573f73af55/45988401696.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c85f47101d---filatuzi.pdf
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865dc72b6c0---70014523653.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/59ab84a7296aa63939a0f2e1a2a41f35/55557495196.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63fd02d53f---3610132890.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba7b30285a---36853614017.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bf36645df97---pinulemozux.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af5957962ae---maragizavorusadudag.pdf
    • https://hitpoint.tw/userfiles/file/kodofokelotigosopibejak.pdf
    • http://jullien38.com/ressource/site-image/files/39918738670.pdf
    • https://jairdefreitas.com/ckfinder/userfiles/files/pumexelinewurovep.pdf
    • https://istocdukkan.com/userfiles/files/53421830229.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8450c12aa51b06db728497e240d10b63/tidevage.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/9rgrk4to08cg829fnbfvea3jb3/50853255636.pdf
    • https://ivanda-commerce.hr/userfiles/file/14187635349.pdf
    • http://tcurryproperties.com/konadnew/userfiles/file/wapekirumelogoxi.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608769df3822a---83304994646.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbfb42f33b---panexegitawokijufem.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_off0001004d.bin
d7b3b4057b87bce2fa2919946cd7d156157ee41418a60bf7cc161baa170701dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1004D 17912 bytes
font_01_sfnt_off00012dda.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDA 16792 bytes
font_02_sfnt_off000145f1.bin
c30745bbb4b8da5534dcbeed291213a3411e73695c47414fda4eadcb0144e13c
pdf-font-stream PDF embedded font (sfnt) at offset 0x145F1 11024 bytes