Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a46adb5687d400…

MALICIOUS

PDF

84.4 KB Created: 2021-09-05 12:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1adb3c063ce6a5c1ed27d34f5066ae36 SHA-1: ae028b340b800c4d3ef725afd95524b240d5dcbf SHA-256: 82a46adb5687d400e80291c7222fd820253203b9c25897a218f75252a14727d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating it's designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=the+complete+breakout+trader+day+trading+strategies+that+work+pdf
    • http://amphorabeautyclub.com/campannas/file/22143042899.pdf
    • https://keongracun.org/contents//files/57160863999.pdf
    • http://cokhilegia.com/upload/files/zumesadisemov.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/ag8d20pilvscer419gktsp5p39/wilakifuvumofubawokokem.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/1inljm40urjgjjtrcttv02f6jc/kebuvakekek.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/f1fa09239dbf0f1b7b2b4493d63a037d/bimopo.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb112ba2a3---ganuno.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783e9ece89b---wisiwirovum.pdf
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/41739790507.pdf
    • http://centromp.it/userfiles/files/zowufu.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/egaebva19hl6g37e12g5g71jsv/jidazofezaxixadedoxuk.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/strqvi3ub6hi2t7snce4f9b6lu/pamajuwepusavuxaxejelim.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/280f29d11378a5fe6b087f8b386c12ad/nikew.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/fb3ed0c47f4f7e78d701435589f8c874/62711125154.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071047d7b459---15052651377.pdf
    • https://gamaconsultores.cl/upload/file/zexex.pdf
    • http://e2ingenieros.com/ckfinder/userfiles/files/rigesesosogipiwutoreperi.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/df177704d93719a2e06b8ec1ea69becc/zajovosekopa.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c7b2883d48fd1c4572b74305fb115e59/xinabuvejivokadoku.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/6e6c1854fefb3ce3e6c1affa70f574b9/49916313045.pdf
    • http://clubselectionvoyages.com/images/file/rewikipufajefop.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160ab16d49a90a---59428938320.pdf
    • http://chroscina.com/userfiles/file/xowaviro.pdf
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/62153425348.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_off0000e23c.bin
ad1e285d09944f522519aad4ad6fa16acd2c6314a5e9740aa1d0ab4f64db56db
pdf-font-stream PDF embedded font (sfnt) at offset 0xE23C 17728 bytes
font_01_sfnt_off00011011.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11011 16792 bytes
font_02_sfnt_off00012828.bin
8264cb2d8173d22c69c2b67ec49ccf4b8584d4f60685f7902af01a73553e1a7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12828 11564 bytes