Malicious PDF — malware analysis report

Static analysis result for SHA-256 50f3580015266c88…

MALICIOUS

PDF

86.0 KB Created: 2021-06-29 04:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e8c98dba0c0ad07ed749a7ec2423e038 SHA-1: 848ba4de30c9320c8252900e5477ef37dbfea433 SHA-256: 50f3580015266c88dd2dd09afaecea926e0d7e66eb3e9bfe081b4ee11cee6e13
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to lure users into downloading further malicious content or engaging in phishing activities. No scripts were extracted, but the structure and URL analysis strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://orchid-daikanyama.com/userfiles/file/38159720488.pdf In PDF document text
    • http://www.firengo.com/userfiles/files/69140172886.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/64540762958.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/b0440ea84fb631070b3a32af74689f39/67110240986.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/2119754038.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/c060008e8bea0646f5f85fbb34ec8ce1/rusuvoxivonadosizuwali.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/wosowulemizejorejodi.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/wizosejevigisowigoturaf.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/36650951496.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/xujogademigisoleji.pdfIn PDF document text
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/resaxanax.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085d0ca2f7c7---davepa.pdfIn PDF document text
    • http://3q1p.com/upload/file/210626034126375001be6nwm0jn73f.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c39f1c7109a---bupalewokupig.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607efbfe6e116---1701191734.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/35296170124.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b80f06da34---19865263626.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/cqbao2kuvtfo60quot8n2uc59u/58360410762.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050400151937.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/2578ec7daad3b0206d14074a3deea539/34141871588.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/ruruvupebevopakadu.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/mabovidela.pdfIn PDF document text
    • http://momsystem.ru/public/file/sopijotaku.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1623583081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=watch+big+time+rush+online+free+full+episodesPDF 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_off0000ea8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8D 16824 bytes
SHA-256: 71333389aba9508030b3a301b066f4a73da81f237bf13c2402cccc441286c04d
font_01_sfnt_off00011685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11685 11300 bytes
SHA-256: df038af6133ba4ea6a2f2b7298306ca4d4d5dec6f31f90ead8b74c49f1ed74c1
font_02_sfnt_off00013083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13083 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1