Malicious PDF — malware analysis report

Static analysis result for SHA-256 f17be9b89fbf5ee3…

MALICIOUS

PDF

76.8 KB Created: 2021-09-28 12:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 546eb6c669ed577f7ac843e6297d09d6 SHA-1: c5bcea621c23298cbb521d2120260ba53484f465 SHA-256: f17be9b89fbf5ee3a26c888de1670bb8013880db3cf968bffe517c8135cef578
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://synerhu.ru/uplcv?utm_term=william+marrion+branham+books+pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/qp7mvkjbn6gh7a7s8tg2fg89be/mubobevixobe.pdf
    • http://gniortho.com/files/Upload/file/dujamupevifupakavixidugu.pdf
    • http://placc.info/up_image/48492073412.pdf
    • https://vzglavniki.net/data/file/mugogofimadunipimuwowilo.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fd517d6dd4---vizazojeseruletide.pdf
    • https://orrizon.ru/images/file/21433645509.pdf
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/gegobogitojo.pdf
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/vagexugafukovilivomegi.pdf
    • http://elturo.ru/img/upload/files/venigat.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0fdda07eb---9076957756.pdf
    • http://agataklimowska.pl/userfiles/file/4718486285.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133b1779ec4c---6156775273.pdf
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/xupifate.pdf
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/lubadakona.pdf
    • http://www.flamanville-76.fr/upload/file/miwakime.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/962ef90bcbd37fcf03efdea8fbc7ac3a/87584607921.pdf
    • https://testagenda1.myagenda.cz/pictures/editor/files/47329914085.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/03149f764850826ab7e9db100ecfff23/dikapaguzixufukidalizade.pdf
    • https://ww150002.linebot.net/upfile/files/20210923101501.pdf
    • http://musorcentrum.hu/files/article/file/gagafodinopub.pdf
    • http://mishor-uvk.com/uploads/files/fidomufukobunukun.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/wadodenotodekanunujuse.pdf
    • http://yigang-lin.com/uploads/files/202109231209415562.pdf
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/rokofipalazoduw.pdf
    • https://www.aukuras.org/ckfinder/userfiles/files/wemuxexilelexosimuxe.pdf
    • https://lapdonline.org/file/babikilubuvifufexinelox.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_off0000c17f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC17F 16792 bytes
font_01_sfnt_off0000d991.bin
a5ccb027198aa60b9ba1183b6f9c5fccb7f93507374e2967efcb430ce7255182
pdf-font-stream PDF embedded font (sfnt) at offset 0xD991 19628 bytes
font_02_sfnt_off00010d85.bin
14ca426abef50927c408ae59fe289270bfe2b5e940083c06a8e379ca396fb23b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D85 10756 bytes