Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0f51b267d43b5e…

MALICIOUS

PDF

73.8 KB Created: 2021-09-15 16:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 85a2405ed4fcebe319b75221fc9cc615 SHA-1: f01a92b3dd461cd7444b7b2163079ec2da43696e SHA-256: da0f51b267d43b5e78a4d334122db2c95e76ce99b46f1cf3d56a684693337ef2
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS uploads, indicative of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=page+curl+effect+in+android PDF link annotation
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/70562306580.pdfIn macro / runtime command snippet
    • http://bixenony.com/userfiles/files/56596302797.pdfIn macro / runtime command snippet
    • http://jeyadhurgatemple.com/userfiles/file/wikikadofejigijuxa.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/56636725184.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/balaxibidivonifeb.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/kuzitukuxelap.pdfIn PDF document text
    • https://bursaphotofest.org/uploads/files/guxuwanepafotidowukuvasiz.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/9006609048.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613608203b2f1---8920461184.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/8d5hhq3gcfjga9ai4jmlhhn03u/90596103502.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/69787527091.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/naxakaxabigudunodurugalok.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/98608564912.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/67734feeda973afb173ad934f7bb80ee/dinadinemiwaxin.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/57064426169.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/91353527781.pdfIn PDF document text
    • http://olympusflights.com/files/files/zaxudevozijuselopikivubej.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/ninokek.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/gelol.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/8tcjtq31sc8s1iav9lqmml8c19/kerorawukozizufinimedugu.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/41165053161.pdfIn PDF document text
    • 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_off0000bd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD3B 10584 bytes
SHA-256: 4d06ec84477fb3c0cd2f4d3d2bf82b9fbebcbc8b592682699c83d2145ca39b35
font_01_sfnt_off0000d548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD548 17220 bytes
SHA-256: a0a8d40aa7489e316029c351174c475bac87b0fb9a4978cd96100a386afa01c2
font_02_sfnt_off00010209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10209 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.