Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd0cba3b377f7cd5…

MALICIOUS

PDF

79.9 KB Created: 2021-09-21 04:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fbcb1a40a99a473775dce5a2c0f53404 SHA-1: 25521be29438df488ce81f48d9ae43863568d7c0 SHA-256: bd0cba3b377f7cd5b47fab94cb73319a15f59435242431a710c63144548a6c77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • 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://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/fa45b919d19672c05929a09b4ced0164/molakefob.pdf In PDF document text
    • http://saveursetsavoirs.fr/image/file/toxuwozato.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/nepubaj.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/zigixogisisonuguzowo.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210917220915_1691223259.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/86292836748.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465ec511f2b---3001914516.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/99439072920.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/rajuvaraxij.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210906_223309.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/jekami.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/40866636029.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c300568e7---saxazagu.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614175c1d5020---bumewukasina.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/7ae30cba79ea93008debbb22adb65f3e/123084961.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/2fe6ec57f3739e016088a4cd28eda7e5/55790029840.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/pobevovepunugidal.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/ganoburekitimelava.pdfIn PDF document text
    • http://rococosofa.com/files/files/gulotagetonor.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f42f8960e3---telokalopuwudebuwanixeron.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/tatunuzomidi.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/monet.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/kezofi.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/30304112309.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/venokerometifejusukanek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=super+mecha+apkPDF 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_off0000d600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD600 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE12 17548 bytes
SHA-256: 1d93dfe18500fcb4f35a4bbc015cba87242ffa05f6e1baec011835f839b0df45
font_02_sfnt_off00011b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B32 10280 bytes
SHA-256: 5089df9a2989492b502478d1caa373a9a2e17dcff72c80880a2069266d4af3b8