Malicious PDF — malware analysis report

Static analysis result for SHA-256 d804410793b6fff6…

MALICIOUS

PDF

76.2 KB Created: 2021-10-26 16:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0110835ef11c79830c4cd42d50b1e592 SHA-1: f60f1c5c5285fafd07d05d81008e3a6e3bc2ca7a SHA-256: d804410793b6fff6e862d86e68d4ea88bc80da64c7e3bd2602b6aeb8cbc26052
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that direct users to external sites, some of which are hosted on compromised WordPress installations. The presence of multiple external links suggests an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://renewone.de/files/jenubapiwozuvazo.pdf In PDF document text
    • http://el-master.ru/userfiles/file/55432556836.pdfIn PDF document text
    • http://nemalipics.com/83722021286.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/juzepuwufoxi.pdfIn PDF document text
    • http://www.bash.cl/media/file/maseretimode.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/xajadagatixumewadeven.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/t8aikld6nhaha27u8hcslkhat4s6fuhr/nasuwapewat.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161406d2c871c2---jogososedek.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210927_001227.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/9dj5aoqbusfaru4hakd4fisjqm/83525821014.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/nazebujekovokeke.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/39128097683.pdfIn PDF document text
    • https://ambalatender.com/upload/files/23483097585.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/rasulojibefopoxuzuk.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/36443371981.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/lebometogezolopib.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/91961942903.pdfIn PDF document text
    • http://quangcaovuanh.com/vietkiendo/upload/file/77538474842.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/sexuz.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/xigifarorekelomoduxupage.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/negewekemapotezus.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/90079612627.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/1hHberoKktI/uplcv?utm_term=a+good+onePDF 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_off0000c7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD9 18208 bytes
SHA-256: 61a7acb6e0fd0acbbaf8edd84045046d872ff56636f95b3a94d516c894630840
font_02_sfnt_off00010ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF0 9740 bytes
SHA-256: 3eb4995658ef6a79cf29f8a734c0e83cc447b1cdef497aa38adf65696511e975