Malicious PDF — malware analysis report

Static analysis result for SHA-256 5efce5947bad8336…

MALICIOUS

PDF

80.9 KB Created: 2021-09-05 23:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7465f6642ca624e4476ca76ad5010606 SHA-1: 1820298b4fa73a6683a95b545699a7f6a89bea77 SHA-256: 5efce5947bad83362dc331007cf9c29c0a21945d023a3091d1d63203a1e5b4b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised websites, indicating an attempt to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://selfmadefilms.nl/userfiles/files/kizonamedevaval.pdf In PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/4b4123f12b24404ed82c7aade2d2b99f/40288145504.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/80565746288.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/35415445957.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8a735685e---1878739211.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/94732560654.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/popoj.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/67753282571.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/36a88ceda6a301fffbddd01c909003e7/13696025595.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/0861e807ae7ea6713310cd819fdc029d/78900231483.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/zadiwofinojinoxemofewufe.pdfIn PDF document text
    • http://ty-int.com/files/files/tadifewosetapobimaw.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/nerarodoruxuvexi.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/75392039583.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/82536722891.pdfIn PDF document text
    • https://realschoolspirit.net/scauserfiles/files/kuxijulurizejuzejevam.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/i4n7m8noggtv5bv6l8nmf35k40/28781622396.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/35990416584.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077abf8a1f58---zivoribofedepuma.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c757fae40d7---71878341120.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/96169521788.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/7c85dcc9567d5cbe94ed6ecc61539ebd/rikuvijusodilituduxizu.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16104071c67d42---14997914706.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/24772597542.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161217a556aeca---lubat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=kensington+and+chelsea+parking+map+pdfPDF 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_off0000d650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD650 17612 bytes
SHA-256: de0b4c32871fb3aa7324c98177b5a228dc5e64bdeab1b880a7b5625ed3ed701d
font_01_sfnt_off00010441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10441 11152 bytes
SHA-256: e7561c53c3b3e6b5cdbbb14143110a2d94784ad4d78c2cb837cba0c4f86bdc21
font_02_sfnt_off00011df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1