Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7704f160964439b…

MALICIOUS

PDF

71.1 KB Created: 2021-09-04 10:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 17326b47211fb251cd42e130d59caee4 SHA-1: f9be00bb71131d7282292ac3a12f55bdea05ab89 SHA-256: c7704f160964439b3c8b9ab5d55f00f108ebddf2aeff0a817154275dc8c2d1e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to redirect users to malicious content, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://colakcivi.com/userfiles/file/wutevifegobularuwa.pdf In PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/d2334a1bda028ad0f0c1cbeef3828ca4/fukejuwozivimenotoli.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c306842dba---rabeluzepa.pdfIn PDF document text
    • http://simsoncantho.com/userfiles/file/bufosew.pdfIn PDF document text
    • http://turkuazhost.com/calisma2/files/uploads/14638880299.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/tezarapabavob.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2129d048e---20192465279.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/muvisedijatinizutufipebo.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/d7d6b721a930b21099d9cd2b4c5d91eb/15473452534.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608995cb1d60e---mijirixukobumafajizisema.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/97408997399.pdfIn PDF document text
    • http://rowsontw.com/shopadmin/upload/files/72628083939.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/b95p30mhuujimle5la8d2oaib1/digudenivumenumol.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/wokema.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/6216997fd3f98488809a307d838fe9c6/mozeput.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/22267624316.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/riturejefokenix.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/61923998493.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/juxufepexupederedodog.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/wuvun.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/tesixofireruso.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7c2f52697---33607173477.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/17b5bd94829998b8bd5a26d9ca3c62f1/95898424952.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/17385253742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ocarina+of+time+guide+book+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_off0000b482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB482 15944 bytes
SHA-256: 4f634d04e92fd01703714d2959816b17ab9a37f4fb5fe6655de595de5a0dcaa3
font_01_sfnt_off0000dd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD23 11104 bytes
SHA-256: 9deb53f358fd2ccef4e86d318ae4d583a6827d13c92e4b435a4bf91220b4d18c
font_02_sfnt_off0000f6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1