Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8742aed6fb10ab…

MALICIOUS

PDF

70.8 KB Created: 2021-09-25 12:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 470cf9a0da2ffa027ace492702985058 SHA-1: c95061eaadc252e49e5893033dd4d7343c14b5aa SHA-256: df8742aed6fb10ab5e57560e41af5d04c3101d9d62dd4c1346e40842112174ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to various external URLs, some hosted on compromised CMS platforms. The presence of multiple PDF files as links suggests a phishing or SEO poisoning campaign designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=winrar+apk+windows+10 PDF link annotation
    • http://exms.fr/sites/default/files/file/79097898775.pdfIn PDF document text
    • http://hongdacable.com/d/files/41497792823.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/1831591698.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/12570962590.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/dolelujavodipog.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/jujogimerugitorimeruf.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d43cc361f---jokediremadotif.pdfIn PDF document text
    • http://www.alborada.es/ckfinder/userfiles/files/4039068188.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/nusubafovozag.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/gagimijijovikimibosirot.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/c0b18e0ce1552b20b25c312bf916102f/4380333169.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/sogiroburabipaxetaruxafo.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/xomizeterelanur.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161372e2a2c638---31531937568.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4325d5e75---fosaxuporoguwejir.pdfIn PDF document text
    • https://miet.hu/kepek/texivojuxodapefi.pdfIn PDF document text
    • http://lgassociates.in/uploads/29557326830.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/nanomutumat.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/47736972413.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/nukonumopofinubanol.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/fixunugadax.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614d51e29cd3d---23768387712.pdfIn PDF document text
    • http://hanleyresources.com/images/29220204978.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/lupademaxom.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109200236219516.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_off0000b485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB485 10452 bytes
SHA-256: d525e2f17a825e15ab9fef391adbdc2a84ac59baab6d74c3c6f7df8f76050b2f
font_01_sfnt_off0000cc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE473 16060 bytes
SHA-256: 49e95ed902288ee1dc6210eb6d713cfb94a23a3b6c0be6f0451a87a5277ddbbf

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