Malicious PDF — malware analysis report

Static analysis result for SHA-256 978a110caa752942…

MALICIOUS

PDF

69.2 KB Created: 2021-09-18 06:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e2ce711c921fbae37ce146e8fd58aa5 SHA-1: 6384cbd6a500af3cbad1038cdfec5dac531a4ba1 SHA-256: 978a110caa752942ea0c16e79001791d58dbcc927be8d688a27a2acf3ee09c8e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9135

Heuristics 5

  • 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
  • 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://coretry.ru/uplcv?utm_term=hello+kitty+games+apk
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ce1f4ec6f---kopaxevevevetufutoluv.pdf
    • http://espaciocultivarte.com/ckfinder/userfiles/files/wokepifurukofezoladegufaf.pdf
    • http://ttmplus.com/userfiles/files/penaju.pdf
    • http://kastely-vacduka.hu/fileok/file/kipemuwakurumalu.pdf
    • https://madeirashopping.com/userfiles/file/gebatipa.pdf
    • http://cheumst.com/upload/fckeditor/file/70282697992.pdf
    • http://jamxmpharmatech.com/upload/files/31139736955.pdf
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/77986163561.pdf
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/29072113411.pdf
    • http://bordahusfeldolgozo.hu/editor_up/lupanududimuvasu.pdf
    • http://recuva.kr/upload/fck_img/1631286364/file/79214318850.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c18b08e9ff---59721215520.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/09992999cde37fa621d99eb80ce8e8c2/10929972190.pdf
    • https://kisikana.hr/UserFiles/files/25304646872.pdf
    • http://thewesternmist.com/userfiles/file/gexegamipizuwilinibumito.pdf
    • http://snft.ro/media/file/riwasekuluselesavorix.pdf
    • http://densayhongngoai.com/uploads/userfiles/file/sudixegevujofefuwerebu.pdf
    • https://fiberglasssupplydepot.com/userfiles/file/lusitavebanoponanuvabog.pdf
    • https://vanchuyenduongsat.vn/upload/files/bodivokovonedivupudafuw.pdf
    • http://onelove.cz/file/fuzivo.pdf
    • https://smartbrand.ro/mm/file/tumavitaruxilonug.pdf
    • https://gberwanda.com/gbe/useruploads/blogs/files/51174110787.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/dbblnsovvjumtq1k1nv1ntdv7k/modovugevalekavoramatugo.pdf
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/zuxivofuwopizu.pdf
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/62962365330.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e09c.bin
ccb1ce9675e3b7985ed9c2bb6c2e37cf413dbb11eaf32d0395250e8e3b48c06a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE09C 17776 bytes

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