Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2615727e7dd0c51…

MALICIOUS

PDF

84.5 KB Created: 2021-09-01 19:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ea520ceeed20cfbb1a2634351f17a418 SHA-1: 768ae471015436c8f12690771dbcd8886f6a5095 SHA-256: c2615727e7dd0c51a5888561b97a012a4726258d34d19e58df8a59f5cab75252
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links indicate an attempt to lure victims to malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8422

Heuristics 5

  • 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
  • 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://wastran.ru/uplcv?utm_term=meaning+of+pee PDF link annotation
    • http://maekuangudomthara.com/ckfinder/userfiles/files/55692531734.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ebccc46ab---bupukakikagamali.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/roluralifawirafexo.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/lelimewisujogitu.pdfIn PDF document text
    • https://okna-kurska.ru/page_edit/_samples/userfiles/files/lavekif.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/628a7f4428fb1179d279cb9074596579/gofexokomazidamogapotu.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/17594381980.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/wodorukore.pdfIn PDF document text
    • http://geose.ru/userfiles/file/womudexodib.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26c5654220---zozawama.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/13e35104454692bccaf8fbfa9c3632b9/90364471513.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/kugufamo.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bad7a44f12d---sigirevuxikudenoseniriken.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874ea956f5b---29262887905.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/4325666504.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/97321318731.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210612_205434.pdfIn PDF document text
    • https://shidoremicrosys.com/media/85018884378.pdfIn PDF document text
    • http://ithaca1961.com/clients/875375/File/jasirebidareretofugote.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/pirelunosagotalajigox.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/5241529171.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609273bb55842---bunupimigimudivijuf.pdfIn PDF document text
    • http://weddingceremoniesbybev.com/clients/72651/File/30298284105.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCE 17364 bytes
SHA-256: b2b71fb90ad05ce1f1b8b131bcead84bc7e627d9c53fae44ff6d2742e6d62214
font_01_sfnt_off00012c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7A 10112 bytes
SHA-256: 43d1aed57968924e9feaa2d0411caca036906f7576293f7f75fe196d37e8dccd

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