Malicious PDF — malware analysis report

Static analysis result for SHA-256 39acdd0c2715601c…

MALICIOUS

PDF

84.6 KB Created: 2021-07-26 03:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c3b71798ff1aed50fd816c90bd32b060 SHA-1: 7c7d9f1683bc62c3a42a1d0d7352fdb4ab40096b SHA-256: 39acdd0c2715601c885ef7264c77f761e5d873ef2347964739e1ad188f4971d4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6130

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://xn--49s538bo8ux8c.net/userfiles/file/difikukajekila.pdf In PDF document text
    • http://studionegrelli.it/userfiles/files/36215992190.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/5ac6h1v1g1p3242cdrejn6oudo/povakelagenalatetebav.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16074a57a35e91---81546487660.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ad4e26999---51937673033.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/37048136580.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b822d2425---patajix.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/pigizebofinibekisiso.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/f56f0ed606d91b7ea9de6b36da89af26/3714004916.pdfIn PDF document text
    • https://nexusmediation.nl/files/rezoxevelawuj.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160b89ecbd5170---28473915320.pdfIn PDF document text
    • http://lafayetteconnections.com/clients/52818/File/jifunuxoje.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/a3404bb158121b43e0786b4b5028d6a0/12063577248.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16091496d828ec---1437178215.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/23baf2bb984307a1d209d5e038fb156e/72283923547.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780c224e70d---gojepadoruzamog.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/kapavewove.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/asq3rpar0maih8ctkr3r00dll5/ziwedakabasuponovoruro.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///mivegefefikorepubojal.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/b554552f0fde8b448253ca69ba424ceb/daxowe.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/c32c8092c53070a5d72abf7e48ff36ad/todamuwutevezewepi.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/4fd71a9204bd2a001f944255ae7d9088/lexelekizivogax.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/cb5c8k20vu5h9ulf3f5g1uc9vr/65000081619.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/beb397cffc71c688b8df7025548c5856/jedige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=tres+veces+tu+pelicula+completa+en+espa%C3%B1ol+descargar+gratisPDF link annotation
    • 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_off0000f62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62D 17288 bytes
SHA-256: 61f70fe0723d8a6439a4da919f079091c9377d3f94d15e21a7becb76b4b0856a
font_01_sfnt_off00010e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1E 11192 bytes
SHA-256: f026ea2d6a1f4999403db8a0f90c266d16a9e34df0887b370055847fc6a3ca30