Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d3c72902fade7f…

MALICIOUS

PDF

84.1 KB Created: 2021-09-19 07:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2229e889b44147d1bbd3768263bfcfd6 SHA-1: f0f2096c5c12b62028216aba6254cbedd2862ba1 SHA-256: 40d3c72902fade7ffb64124d4191151b2750bf1283a836987d846c09d4cd99ed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://majortaylorride.info/images/uploaded/file/nawufijabexinoxub.pdf
    • http://ivelinabozilova.com/userfiles/file/64507661278.pdf
    • http://ing-ka.com/user_img/file/49669883357.pdf
    • http://ms-krmelin.cz/app/webroot/files/files/93638209590.pdf
    • https://igk-lilienthal.de/downloads/gonomerofobawubebapenak.pdf
    • https://km2804.com/ckupload/files/romutavitufanifed.pdf
    • http://buyo-g.net/userfiles/file/23146716336.pdf
    • http://pincodehub.in/userfiles/file/19279147824.pdf
    • https://clubelsendero.com/img_pag/file/murazakajigeripek.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332ce144c1a---jipatorojebinowepofozo.pdf
    • http://finalstage.biz/js/upload/files/danaminenolisimalelo.pdf
    • http://www.koeru.eu/failid/file/lexev.pdf
    • http://yesfabric.com/images/upload/File/81152881457.pdf
    • http://akcihlar.cz/userfiles/file/75865322963.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/psjsft4jhnrqgd6pq3iu237s42/pofepuraxijubow.pdf
    • https://mwasafat.com/uploads/files/1749909699.pdf
    • http://alrabbancapital.com/file/files/18236211316.pdf
    • http://tecs4.com/intranet/ckfinder/userfiles/files/tunesuzijumizubotini.pdf
    • http://turinhotelcompany.com/userfiles/files/timusurirebod.pdf
    • http://ownlines.com/upfiles/file/2250189713.pdf
    • https://aspaeng.com/files/image/files/revit.pdf
    • http://qataminational.com/uploaded_files/userfiles/files/55956474501.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea6e6c8ecf---dujugazumopibixurude.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410dd425084---43277254772.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9d2b38221---fujimapenutubolugubu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=borderlands+3+two+players
    • 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_off0000e13b.bin
d0832f9d484302fa78766571cdc062d59f18efa04abd936d239369d6ab9c4719
pdf-font-stream PDF embedded font (sfnt) at offset 0xE13B 18524 bytes
font_01_sfnt_off0001117a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1117A 16792 bytes
font_02_sfnt_off00012991.bin
9cb6f18db87a02b9a9b5ca494836bfe2b191e603166e60705ccee76855d3f0b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12991 10720 bytes