Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4c2e306cbd9357…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 13:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5b38855671a8b5016dbe579980d5c2b1 SHA-1: d731c57d3b144b9113909ab83c41906918346baf SHA-256: ff4c2e306cbd93573507de5fa528fc307adce76ffa47d75ad20c01b5184d3e87
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm pointing to potentially malicious content. The ML classifier and ClamAV also strongly indicated maliciousness. The embedded URLs, particularly those hosted on compromised CMS uploads and disposable hosting, suggest an attempt to distribute further malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://chinalanpa.com/images/upload/File/20542914177.pdf In PDF document text
    • https://mbamantra.com/ci/userfiles/files/ludepevogasoluzutalar.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/vazozabeda.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/wanavexibobabapal.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614249646454b---rajosomede.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/13466334594.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/3855bcc58f1d61cc5b520486257c3080/gopulijufawenuzuk.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/74699493146.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/4735310538.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/komapuwudukuxuzal.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/sumemejomako.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/vexaxofefusuvetufiridibex.pdfIn PDF document text
    • https://bczenekar.hu/files/file/sojojorodebugik.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/67093365566.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/46296173815.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d10089f73---paluliripofagupikunax.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/20819362352.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/35300253049.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/zukawajatebason.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/5180189537.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/bejubazenivex.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/kabez.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/a9d5891ced51410856172cab964c3f2d/ketenebalubazetuzala.pdfIn PDF document text
    • http://harlit.com/upfiles/file/38890614810In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=say+yes+2018+movie+online+freePDF 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_off0000d8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C0 17536 bytes
SHA-256: f36dffa01387547f1b52f55fba9bac95b513c29b7e49ab868cb906b3f1013c4a
font_02_sfnt_off00011d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5B 11032 bytes
SHA-256: 68dd82f56bd1c4db99136cbd521b09cb62c9cacfaa1d72f5b973467120ecdd76