Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b5a967ba7f349c4…

MALICIOUS

PDF

70.7 KB Created: 2021-09-17 07:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7e8307c81a4b15f72adc5b288b763711 SHA-1: 88b4c9d04d0f9a55e607673cfe788c8b3c0a5237 SHA-256: 3b5a967ba7f349c4946f482c811ffa691ac70b50937809da58e9c8938ef03119
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable hosting or compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a tactic to obscure malicious destinations. The embedded JavaScript likely facilitates the redirection or further payload delivery, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://philabc.ru/uplcv?utm_term=shorten+video+on+android PDF link annotation
    • http://chinalabware.ru/d/files/zifokewimoxam.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/bidixifusinexa.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/44749289542.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/vixujusituvivib.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/robokagemotifewimugeb.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/rojigesugapolofe.pdfIn PDF document text
    • https://fond.ru/userfiles/file/11044014631.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/nomuniduzebiz.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/miluti.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/kl12st6ugpfb29t8btqufkobp2/bugegoroke.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/2def9d7242b5eadfd32880632552db57/89609573692.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/40199703369.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/rafezamegexeban.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/55788694116.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/78537366738.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/47715029301.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021090900473448.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff0db148db---gulorosujezeset.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/71936893488.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/16743101266.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/liwevotav.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c72aec000---69151274787.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/segazobijetaguvunuveju.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/053b3e33c54c9469e83bd80261c09efa/64923056730.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c555a11cc---4588727947.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB691 10272 bytes
SHA-256: 372790c0ae8de1fcb7da7a81cdd69d418cc46ebba020ebe6e4f0ece70e4fd936
font_01_sfnt_off0000cda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA9 15480 bytes
SHA-256: b8b09adccedd9aeec9e4d33e57eb57860f6d1c1f00c1d048bb6ec2a525c5a927
font_02_sfnt_off0000f4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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