Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca763c2acb3b9f85…

MALICIOUS

PDF

71.9 KB Created: 2021-09-18 16:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 51da0a6de27444881f0a2d5c82456bc1 SHA-1: 6af0b787280645fdbbcd87e459eae60f19361c09 SHA-256: ca763c2acb3b9f852f79d9d0aad4abcdf0b666a228c21898ab7667361b87c527
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. It also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded JavaScript indicates potential for further malicious actions, such as downloading additional payloads or exploiting vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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 http://www.scea.edu.mn/ckfinder/userfiles/files/81096485984.pdf In PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/44618800030.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/setok.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/pizob.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ef6ad2fc2---vowikikonebavixem.pdfIn PDF document text
    • http://ashioke.com/images/library/File/31271837788.pdfIn PDF document text
    • https://harley.dataroom.tw/upload/files/29142684926.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/nvchpsik979b71g7fc18mop18m/xalakiwolonokisixaguxe.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/somuta.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/99531334023.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/zijuw.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/16080787739.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210917202608.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/duketagudi.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/lebobexudutafonapijur.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/tozipivojuvedigevaruzab.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/j6lkucqvkbhso8i6abq7av60i8/gomopaw.pdfIn PDF document text
    • http://okun.su/upload/file/49529038208.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/4884591188.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/tuledoraxuvusebaxazuxas.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/17935829538.pdfIn PDF document text
    • https://limsurempat.com/contents/files/kufafasuzoratevaguka.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/85742121417.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/jenaralugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=chat+gta+v+pcPDF 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_off0000b9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9BA 9988 bytes
SHA-256: 1c86e04f9cf4740c4e8847a3f9e824175b560f22aa4c7fda05a0af3971bfe7e4
font_01_sfnt_off0000d019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD019 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82B 16396 bytes
SHA-256: 377748c936aba01365ffb763c3796c2d99cca0665e4e58370d0c8a432108db23

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