Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5225a0f75e65ef…

MALICIOUS

PDF

84.6 KB Created: 2021-08-10 22:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bfd63cde9f64b1f614684c84e6fb45f0 SHA-1: c3ecbba766583569f0efb51a9c922678d98652f3 SHA-256: 5f5225a0f75e65ef708d2ad42e6bb097b7e3e434661a1fdf6c49b90d86f0d298
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. ClamAV detection as Pdf.Phishing.Trojan further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6012

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/rudekonoponelulodik.pdf In PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d034e3e4b---tujaxujomuf.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/fomuwi.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/da891003fc638900ffba213eb9cc337b/xinozinuduposofaz.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/1603067844.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/57906492427.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb17be5a95---7518680794.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/7425769152.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/caf51bbcd77352ec9398214e806dfcb4/58076340788.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/6s25kbmmhct667q1d3qkq62so6/38079398555.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd43f9f390---31635186073.pdfIn PDF document text
    • http://lukinserv.hu/file/15566572922.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/9cmi8a36ebhvemij0otjnouq2g/54452834301.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06b902d055---84383702058.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/69cecfac520db851017dd32843a5613f/sevasisufaxuxekurawedasa.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/11ba47ae9be273d01f7552f23252719d/1142170790.pdfIn PDF document text
    • http://kodemari.info/data/files/wasogez.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/87445324369.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/c40956f8c12a6906e98b96a11d308f12/gejolejaveg.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210706_A20B64C7FD622098.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/9cj3kk2qiogmsdf32autvsnd13/buxemuninonotikiwiwuxa.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/zinegadolawonaxazapefo.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/0c2d3fb6d9e2cede2dcacca2e86d5466/pezisipubazerexa.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7e451f5a1---tuditatevaxogexeze.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/7b0bf12c64e96bc5fed044e938b77aaa/98358191291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=grade+10+filipino+module+2nd+quarter+answer+keyPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11734 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1