Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3bf75fd89bffce8…

MALICIOUS

PDF

70.8 KB Created: 2021-09-28 04:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f08eb0c7a7ebae36f95b03dc05fe7dd SHA-1: 07b37701d5ba73cbbb05d6f85775b05ba7161292 SHA-256: d3bf75fd89bffce897922f0c181e92627e981e696e9dc1e3d3e7697b7a71c7a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to exploiting PDF vulnerabilities to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=the+ballad+of+buster+scruggs+full+movie+watch+online
    • http://guidesdugrandlarge.fr/images/import/file/lotixorodojozorawunuzab.pdf
    • http://irvinenott.co.uk/ckfinder/userfiles/files/lujojupisenozibalipamu.pdf
    • https://egf.tw/test2/images/file/87509233888.pdf
    • http://ichieh.tw/uploads/files/202109210121335794.pdf
    • https://mimpi1pusat.com/contents/files/96359475920.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/e083245afe75deb53dbce5542c1ec409/dukekigipav.pdf
    • http://xy-interior.com/uploads/files/202109042136077373.pdf
    • http://hgbs.de/userfiles/file/ralotapixamokelu.pdf
    • http://dymenahealthcare.com/upload/fckeditor/file/wunujawuxefavub.pdf
    • http://hig-hegmann.de/userfiles/file/tuvowosexesipiwidelulujol.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/a51da9c5a95f76113b463f8da27958c3/47926296847.pdf
    • http://chizclean.ru/files/fck/file/5433793410.pdf
    • http://zatoodesign.com/userfiles/files/10779147615.pdf
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1632735117.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614d9f0fc33ee---duragamivemipolate.pdf
    • http://cck-brno.cz/ckfinder/userfiles/files/zawinodiv.pdf
    • http://primethailand.com/ckfinder/userfiles/files/vewokuzegifew.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151eae7e5f76---76604328558.pdf
    • http://winecellarkeeper.com/ckfinder/userfiles/files/jijanejil.pdf
    • http://www.anclupnapoli.it/userfiles/file/kagiwu.pdf
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/xitugosobatojugaludo.pdf
    • http://ibconsulting.it/userfiles/files/75179295564.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_off0000af29.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF29 16792 bytes
font_01_sfnt_off0000c740.bin
0ca10192c89253fb090f4c26df79293ef8972c558fd27adb782f3458ad72040f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC740 11280 bytes
font_02_sfnt_off0000e167.bin
8c04f7144470f4a15f847d8f1251e592df9ea9acf8272a82594ddc22f29f54a2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE167 17276 bytes