Malicious PDF — malware analysis report

Static analysis result for SHA-256 05516e434546d265…

MALICIOUS

PDF

78.2 KB Created: 2021-09-15 20:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9c06558321942466bdaa86c834970789 SHA-1: 4211bfc553b7e938bfda7c5bfe80eeb5a1fa5f6a SHA-256: 05516e434546d265d035d135783e185110975b401eddd961f8fa9928ceee69c4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicate a link farm designed to redirect users to malicious sites. The primary function appears to be directing users to external resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://pixomot.ru/uplcv?utm_term=words+that+start+with+e+and+end+with+i PDF link annotation
    • http://ylgems.com/file_media/file_image/file/17128897698.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3e3ef0961---kaduwixetero.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/tuzopafozazud.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613610aeb0d42---pabofupafibixanubedabuve.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334a33b78cb---49482462391.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/wuboxowa.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/99169928295.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/94537767289.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/mafepaxitamofovovarojeb.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/gavetasi.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/vojejovanozixug.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/82786313670.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/dosasedegofikalusux.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/lisovokegirok.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/cc1474190aabba0709cd7ce09eb49122/vamovaxe.pdfIn PDF document text
    • http://glttek.com/userfiles/file/gosafupixelak.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/kisuviwenelowaxazugal.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/94753345542.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/sixorazalewojobonozugap.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/30847719584.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/41b35e966ac5327d934c85e595094543/kerupazenapuxadidof.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/22749202434.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/zuroke.pdfIn PDF document text
    • 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_off0000cc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B0 10380 bytes
SHA-256: 4ef544134ee343130c2e4f3afe58b4eef4fb0715b4d9cb961b172d1d7ce06d4a
font_02_sfnt_off0000fc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2C 18112 bytes
SHA-256: 3e6ef92c058e95e1f489a2274c7925cee5b6c8642e35e9124efb6295d53bd18a

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