Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc2bdbe1c804070…

MALICIOUS

PDF

73.3 KB Created: 2021-10-10 07:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9a034df6cb32a09be21e02eacea950e5 SHA-1: 9b0ac6724fa743b049411b0d95073e37fe15cb5b SHA-256: afc2bdbe1c804070486fd990b69b94f9cd10cbf53a40cda9c5e0d5589917b805
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm pointing to compromised WordPress uploads suggests an attempt to redirect users to malicious sites. The document body is heavily obfuscated, but the heuristics indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://osikovo.eu/webroot/img/content/files/94690005799.pdf In PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/popipud.pdfIn PDF document text
    • http://dreamsurgeryen.net/ckupload/files/milivenax.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/44089809140.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/92129638919.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/70000343627.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/95655711101.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/jetowiv.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/40256518054.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/wadomevoju.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/33982537670.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/fikupoxurowukune.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/sawup.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161487030b7380---9090600852.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/vavobafamewemuke.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/dumarotir.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/zonodiwukizubepevosofuje.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332c9d1caa8---51082633794.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615fce3d32a2c---36032390084.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/9125631567.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/9715bf0a1455de1cbd8360fc77d16f7a/sawereremiwenirumagokefuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=lending+company+meaningPDF link annotation
    • 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_off0000bcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DE 10516 bytes
SHA-256: 0d3b6f9c0dfbb2d3035c0e1c8295076d7d639eaaaa536eb2867c73937c30c068
font_02_sfnt_off0000ec81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC81 16888 bytes
SHA-256: 2806d77edd3dd71b043cccd33865fa2614c34d698bec80efdf4490c8e55f0500

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