Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ebcefa2762781ab…

MALICIOUS

PDF

90.1 KB Created: 2021-07-30 04:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 711b178b23bbe49fdfcfadf3089adbd0 SHA-1: 41d6dedcd9e41a309350f691283e2c6aaf65cd0d SHA-256: 8ebcefa2762781ab5dd5ae9043a2d558342840f791a19e0d608c5c7afdb9eeee
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other potentially disposable hosting. These links likely serve to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/h938fkcp8p2bu12jk7a7es4d0c/goraverosolufoti.pdf In PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/a4fdb092afac46dabf0ef28d5fa35cd2/nekevetudujum.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/c656909c45583d890c9cf7ebbf1678f8/fujexufozafujeba.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/wokatidapokuminoboliwese.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/52pc621bv8mfd93ujfu0i4taro/63088692420.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/99907078240.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/jololewo.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/9987ac66fb68c2bd3bfa82a8aa40e117/surebidibopasufuwix.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/gobokuvesikejexuza.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab161dc61d1---podezuxipoxijalolinodewes.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/67460204346.pdfIn PDF document text
    • http://voorwindenotariaat.nl/app/webroot/files/ckeditor_files/files/48408757539.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/77901504359.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7ab8150a---piwekuvosuwawakujarak.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160ba80ea9a9c8---25611933970.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/3dec9d574db9d47c5cac4c594c0c03b8/48094298368.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/10b1a2cf08f47c383917e767825d0528/tufimalafagetarawa.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/zebezoxeko.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/227845981.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/497345602.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/6be6a4e41998857693c31b06b876b86c/28712019595.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/698381372.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da0556d0415---salujilajirogorasib.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8bdd8fb71---80008860024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=egan%27s+fundamentals+of+respiratory+care+11th+edition+workbook+pdf+free+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_off0000f939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF939 17196 bytes
SHA-256: 22e072b2356593d439491909e4e58786404368f6b401d300f75a2ddab0cb1544
font_01_sfnt_off000125c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE0 11668 bytes
SHA-256: 0c34204e978a360f3335aea0e058ac27ca3227c23aa054c1dcb469ec6b20b472