Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5979311e02f767e…

MALICIOUS

PDF

69.3 KB Created: 2021-09-28 21:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af07c25803ba32b6a80fb00b31968250 SHA-1: 33fafa17099a0e52fe81f17006bf5a905a014d8a SHA-256: f5979311e02f767e7cab3b48431aa77716f65d60c244b65256cd5b51851ab28f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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://catamma.ru/uplcv?utm_term=little+nightmares+1+android
    • https://rtvpuls.com/ckfinder/userfiles/files/govarunozarafiveninuf.pdf
    • http://taociren.com/upload/file/2109220618241383777cbdu6zs9i74.pdf
    • http://bephoangdung.vn/uploads/ckfinder/files/serelenenetitimenari.pdf
    • http://bodybybodyology.com/ckfinder/userfiles/files/87539578320.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/dd2300a5177367cffdb3851ad0011e43/812840106.pdf
    • https://zippy-inc.com/app/webroot/userfiles/files/vefevufugusadilo.pdf
    • http://constantemails.com/userfiles/file/1630904307xilepelubarejafijal.pdf
    • https://tsolisp.com/files/file/36976038028.pdf
    • http://global-leasing-management.com/uf/file/jogegimupijat.pdf
    • https://dpengineerindia.com/admin/userfiles/file/46418545806.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/qjauuluulf0ng7nuqt8ff5uqa4/19914530020.pdf
    • http://oasis-inwaste.asia/files/file/16803948151.pdf
    • https://yar-net.ru/userfiles/file/42717997053.pdf
    • https://breedlife.com/upload/files/68256568408.pdf
    • https://alperbehang.nl/userfiles/file/88266869650.pdf
    • https://sunarchegypt.com/userfiles/file/witubikemaxujufofoju.pdf
    • https://mitrasuksesku.com/userfiles/file/84686636302.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/840848e4956be02d3e7b63f33c20f3a0/foribug.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c203b3f399---81003119358.pdf
    • http://toyotarent.tw/FileData/ckfinder/files/20210926_975BB4FA832A0D7C.pdf
    • http://carnow.jp/js/upload/files/sepitugopig.pdf
    • https://n-vv.dk/userfiles/file/30292812528.pdf
    • http://mptech.vn/ckfinder/userfiles/files/nonelidimuwonafatiju.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_off0000aed3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAED3 16792 bytes
font_01_sfnt_off0000c6ea.bin
87024c479856558a420be265e09566327d201d15bb080e24d0ad9b3c10ce807a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EA 10704 bytes
font_02_sfnt_off0000df10.bin
7dcc0ca9bcb629f2b88490c717d5b62a98c69b238c4c0765ee79070bcdbe39e5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF10 16268 bytes