Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c17e4d0fa28846…

MALICIOUS

PDF

92.2 KB Created: 2021-08-12 22:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b5ece00a1b1ecd373532e60bcb4fa32b SHA-1: 4565862dd8d8c25ecd177ecbcd4bb1f64901959d SHA-256: 41c17e4d0fa288466081727175810d1c86207165e5161e0759f35743a3c29049
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting suggests an attempt to lure users to malicious sites. The primary goal appears to be phishing or distributing further malware through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hideab.se/tc/Mediagalleri/file/patinig.pdf In PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/3d5f77660d19a57085f0147109ff0c17/xolifot.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d57dc03175f---belivumena.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b503dad136d---58467616472.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/zegiganogo.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078988ba7f5e---tapafilupi.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/lelezotomubifusofidi.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc0e9217a6---mokufisanafejibugaze.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/lizugukosogeva.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/45271087341.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e35122f475---40101232342.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/2009519782.pdfIn PDF document text
    • http://ippon.lv/uploads/File/namizavijeronukozidafav.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/gejijigewuwumip.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/19473851568.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/89834697243.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/52986227670.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/kuramone.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/xosobofafopukurugogewaj.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dba3aaa8b0d---masisorovatajixogosoto.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/92697822175.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/47914025062.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a575d6d7a14---nupekekuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+use+cheat+engine+on+roblox+for+robuxPDF 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_off0001029a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB1 11036 bytes
SHA-256: d363ee4f4af741b8effcfe95457e4820c0b40975a0957c9f0132c247a9e54477
font_02_sfnt_off0001345b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345B 17520 bytes
SHA-256: 5006f18b6521a2bfd8df5f46d882c33497f556523ae973b69d239a38fa4e6d28