Malicious PDF — malware analysis report

Static analysis result for SHA-256 319ecd98df43ee6f…

MALICIOUS

PDF

58.4 KB Created: 2021-05-11 05:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec92df83583172cbda0131f06d26a45b SHA-1: aae4cbfcdce6b458098aebf1ce63567d84907903 SHA-256: 319ecd98df43ee6fef454e72d084fdecb211d4f103b63fd2c84ad8b40779facd
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites using the Formcraft or Super Forms plugins. These URLs are likely used to redirect users to phishing pages or download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8792

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://medvor.ru/uplcv?utm_term=aqa+a+level+biology+revision+notes+pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c58bf58f4b---72199413300.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160903686ccf64---80203113770.pdf
    • https://airflow-skateboards.com/upload/file/foxuga.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091b851e0642---93676375871.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/be6490335f0a1f2d9368c14274f6e259/93308804498.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/q31bu6u44gf9fgcnj2gastl1f7/venuda.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/ce03e28205d34254d1465875e1e25073/8839345783.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/hfvhq53ojeqs78shadrvqr2fsg/fodakerifubojitokexoramun.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908d21cb267---jixiragamubuzomivu.pdf
    • http://ajtoablakcentrum.com/_user/file/jogutodajexemafarafu.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/ac7en9nk3v65s4mte625o350tj/58686724682.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/p3dkfnk7mqe7bc9d7r04fp3rr3/73983453967.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/0ce6cb01e663ec0cd5cf8ba1e83892d1/748386138.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609260748c47f---wakalumifiretikobufepuze.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/3b8b3574770933645388eb2450b350c3/18280055098.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16095df878261b---saramuvidoxuvewokezenomiw.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bcdfb0f80---xunuwa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da73.bin
1038dbaacf9f38c5cd34b2ba3c377ee53c6e725ae22c7ab8ddda848a1ec0b5a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA73 5628 bytes

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