Malicious PDF — malware analysis report

Static analysis result for SHA-256 295c5a687a1632ea…

MALICIOUS

PDF

88.1 KB Created: 2021-08-22 03:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 25bbbf0061eb85cf091128df9647b5c2 SHA-1: 17ec72d7bd6d2ee69190daa96954ef7125732960 SHA-256: 295c5a687a1632ea5f7df673125bbca4efbaab0042fdb5c0939b99f19cb3ce25
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised CMS upload directories, suggesting it's designed to host and distribute further malicious content. The presence of numerous unknown URLs associated with form upload vulnerabilities reinforces the attack pattern of leveraging compromised infrastructure for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160758d4857fe7---gogudize.pdf In PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7c7b25c5c---wufadepo.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-19/20210619082536868175.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/7f34ceec453c46b055cbca927e159e91/rirumol.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/bmfrf1t4jj3ld64gmm9381ij56/22323118997.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210622171036409.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/xikapajeji.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/01d1a81c4c60b189400064228cd0d3b5/kakig.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/regapa.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebd2c8e19c---63971007051.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3eb647e9432687e4f75fc45e1cd9afc7/dogexitonazobalisevajebov.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/34847886689.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/59b6e9cdcad59e2c25ed0f013145edb2/rimejabu.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021081911354773499.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161083c8630f52---8115215398.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/10121323713.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/10366431284.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/jakapokowof.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/fae16f4c0e8729d259398104535d1986/42800235473.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf222f6f04c---famuwiverenagikupiwomi.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/64139730678.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a92643e0b5a---reronebulofoboniwebi.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/nulitidupov.pdfIn PDF document text
    • https://limsurdua.com/contents//files/jebibogoneru.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/tb8p34r921s2tqa45vpoc7fsnu/98448786306.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607967a63e82f---tafitixazugereweduk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=marketing+strategies+for+small+business+questionnairePDF 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_off0000f214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF214 16800 bytes
SHA-256: 1591241659bff8b9ce9806893c59286a00c8911af01f3fee1c450cb604e36a9d
font_01_sfnt_off00011de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F7 11028 bytes
SHA-256: ca1996ee84b2102786bfda4e61d82f6ef7d4ce5795db7f6d43300c2e838b04d0

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