Malicious PDF — malware analysis report

Static analysis result for SHA-256 69780379e5b16554…

MALICIOUS

PDF

123.3 KB Created: 2021-09-07 01:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 395e3e5938da55485c5f9d0c3ee6bffb SHA-1: 7de06aeba33c74db17fa1c6f95420ec2ba795896 SHA-256: 69780379e5b16554dc8959c20c4403b56b6167a53a8c42231b797199432bf1fc
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve as lures for phishing or to distribute further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • 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://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/b7fb757d7216905c11fcc0441078b931/novisugitotovatifotavega.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb1b1aff10---19233038311.pdf
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/95961021730.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/07jr5bbig45ronp2p0sim14jn9/82535280601.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080356e6a36b---gakuvapedojekogapi.pdf
    • http://chromowane.com/userfiles/file/ladinokexowa.pdf
    • http://cyuanmei.com/userfiles/file/nejolurulozirikufipuja.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ab186ce6c---lejavat.pdf
    • http://blesk-stroy.ru/userfiles/files/14065798652.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/cltg4gb58dr734j49dc8959n96/73058690075.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161368c305af6f---9568782923.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af5a5aefd48---88512423758.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074f91f6b025---605942851.pdf
    • https://cottingham-group.com/cufiles/files/87716509731.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/4140336be96ce789c443fb0ad0156210/88415425581.pdf
    • http://rongqichem.com/upload/files/mawekejolifurasedixef.pdf
    • http://autohondl.cz/userfiles/file/24159043966.pdf
    • http://egitara.com/upfiles/files/31262165369.pdf
    • http://kondicionery-shodnya.ru/upload_picture/file/7269938202.pdf
    • http://aisef.org/uploads/userfiles/file/file/norewipamovagon.pdf
    • https://ubranni.com/uploader/files/29605228452.pdf
    • http://janaturismointegrato.com/uploads/file/xutatenatumozinuzus.pdf
    • http://ellissi.org/userfiles/files/89077931733.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=kishore+kumar+biography+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017494.bin
47948b3ef510db383031b5c87a30a7daecac45754001a84047b44346b4c74a97
pdf-font-stream PDF embedded font (sfnt) at offset 0x17494 21936 bytes
font_01_sfnt_off0001adcb.bin
1481cf491aede7e5f759d996ddfb6aaf45bcbb78896682853fc0e5b7f5845697
pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADCB 11132 bytes
font_02_sfnt_off0001c761.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C761 16792 bytes