Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3adf66d65cb1b5f…

MALICIOUS

PDF

80.1 KB Created: 2021-09-03 05:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ab8151d13505c1caac4b351a0f78d00a SHA-1: 945a0cc795d15eb19d6a46b9485469d519b11958 SHA-256: b3adf66d65cb1b5f3ead3ff827039cd079b1bacbef6a844dc193bded5964218c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised, hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised CMS upload storage suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/a3742e4e68e81bd65cf38908df6bd301/22820852353.pdf In PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cee7498b2e---71813094097.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/74866009698.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/7821957730.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/dowawixulatovapi.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/019c981a8fa863a44f865c4b5c50f20e/nofuwupenami.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce305268bb9---fujuxamoxebexe.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/9375294902.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f499e59da3---34423758474.pdfIn PDF document text
    • http://funperm.ru/content/file/9726518703.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/podibamu.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/85180546914.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/5a3cfafb9256335aeb14540fb12ebb36/wonobenebul.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/32252435410.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/60753306834.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/60009227313.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/vadugaw.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/2ff6c52b05b221d712f04d0ab521daa5/kesorizarifojopejas.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/5d8cafe6d66c5d8174f3c75e4ac3e91a/94873140262.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/72773550447.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/luwafuxegavef.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/pisenapodesezebup.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/71611071330.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=solar+energy+ppt+pdf+downloadPDF 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_off0000d534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD534 17592 bytes
SHA-256: e69c56c3e4b5e25d04f15ca0ccaa1ad09d3c6058bce03dc0263e1a4eef4e9f2c
font_01_sfnt_off000102ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AB 10688 bytes
SHA-256: fcce34cec74aeaf00b438d32917576193cef17b21746847124fc012e0ab8e531
font_02_sfnt_off00011b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1