Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba02f7daa6d5be6c…

MALICIOUS

PDF

79.7 KB Created: 2021-09-05 16:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3197d1c5b3e94d27fde5148ef897b0ee SHA-1: 3fca6d1061ef7f6923c89f0681479c8f20af3134 SHA-256: ba02f7daa6d5be6ce5c790954ff45e65d3f4043eb7383a94ceb7cb550db27fd2
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to external sites, some of which are hosted on compromised WordPress installations or disposable domains. The primary purpose appears to be SEO manipulation or directing users to potentially malicious content, rather than direct execution of a payload from within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://canxetaianhduc.com/images/file/sixazubenunevuwavelebu.pdf In PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/pht0oni67nl3smfoa14ueuce9a/tamufuvorexuxekevogoxanob.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/df7ce809f4d05d54566afa1d9468c633/75578708517.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b85cf0e688---14025629914.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/32597032595.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a919e2a00---25013528678.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbe68604ca6---zotejakagunuxoxuzuwak.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/84150656364.pdfIn PDF document text
    • http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/69654136387.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/87955566044.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b34f840c27---55499598336.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/fudibabes.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/mirigipufumuvuputopug.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/piguxajibigup.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/xojiduzuxamabule.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/hj63mvsdos2hlff2b75nif93q4/pisazexexeravazules.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/57770462643.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/53059456167.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/naqph5jl4ljc768p29hhbdev5j/wejinakilifi.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/23c82eb82b385ff9007d8fe5e7e39020/72583373630.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/217aa1dfc67aeaf7bb37fd9bdf984f72/23429240947.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/19458052100.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b772f154584---godogagamen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=welding+metallurgy+and+weldability+of+stainless+steel+pdfPDF 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_off0000d415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD415 16548 bytes
SHA-256: 571e2fa5831151ca4fc40f62008f9cce8e528f0a17ecf49aecf9ed8da47cb554
font_01_sfnt_off0000feda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDA 11272 bytes
SHA-256: eb5d2445e9711a58b08fae79da13ca22078608664b9b7f78715505a47b0e1331
font_02_sfnt_off000118e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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