Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9b754ee79528a4…

MALICIOUS

PDF

97.9 KB Created: 2021-07-08 01:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: ee8462c6bb091c53a0b498507caa4220 SHA-1: d82aa851fd63d97747da077770d98b1eed95d2bf SHA-256: de9b754ee79528a4f0e02e83d86b758179ade0ceab219a1366e3b397767b5640
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a potential for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6135

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 http://backkwang.com/userData/board/file/pavewi.pdf In PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087f51f30d02---dapusugelurevijiguzapav.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/94830261596.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b3a67d1c1---39689967182.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ac8cef408---wepogufobazutidetajuw.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/ee5d2b229f33718cf788140a687f4d28/pujilajijib.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075558478ed8---10246755483.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/vureniwerajakomixako.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/4fa248d33305159e5623f1797a16ea3d/63012145183.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/78090058078.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/dcsgafliu5s2r1tc2l71tj5k6q/nokarupewamefovoxo.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/24905154948.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d706af9b945---bunozulakatoxab.pdfIn PDF document text
    • http://puppiesjust4u.com/clients/c/c8/c8a8d0e690f73854b1e7a5fbb9521f82/File/gatevipevufusi.pdfIn PDF document text
    • http://usmleworkout.com/files/file/48239488844.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/8023033881.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8ddc222b2---wozanigapijexajopiz.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/tn2n35j7avs4ht50ohbstkl97t/6937714440.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/67605683817.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/d5559f6718d56b8b730670ef504e6311/30644011957.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e155081ae---jobuvidixuxusa.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16086b68427b2a---19739281047.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/4ier4q0vph99rpr73ipbujus84/80431106444.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/sitixomexedorimav.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d3135eb4f09---texag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=welding+rod+my+time+in+portiaPDF 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_off0000fab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB3 19024 bytes
SHA-256: 0e73fda0100889dc8642a904a4310b33c73e36310976cf9615dde2b3fc20b40d