Malicious PDF — malware analysis report

Static analysis result for SHA-256 24a3e5d971977153…

MALICIOUS

PDF

94.1 KB Created: 2021-06-30 23:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4a88ac46d11adc9ecc43fff481a83e2f SHA-1: 5c714f5ca5b1b56a8e10fa792d6603f94bad8b84 SHA-256: 24a3e5d971977153f471c2b0ed66f4b2ed102d80bf67f4297e45a46f0841959c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to various websites, many of which appear to be hosted on compromised WordPress installations or disposable domains. This structure strongly suggests a link farm designed to lure users to potentially malicious sites for phishing or malware delivery. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://infrive.ru/uplcv?utm_term=cpm+homework+answers+integrated+1 PDF link annotation
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/cb2e8f6cd3e509c916363e05c29803cf/50527907358.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/49453878933.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc3d1bf8f7---guletubatol.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/9olgjepb5s6nndd1fnb4l4s0vf/70954758207.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/848a72116653bd5095e9099b31bffea8/jidenavub.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/30649159564.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/a28c790e3036bcd3e16434082f93d730/93384936598.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d207d2e9f50---84397362256.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073822b2fb3a---56655559723.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089228ca63f5---mikelununipuviwapiw.pdfIn PDF document text
    • https://invest.pl/userfiles/file/bidojopubelugovo.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081c4949db45---fevotisunezalujasivo.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad888e1b777---24878049464.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/29741966422.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083797e37a07---bafevig.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/rusujobuz.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888596d309d---33345448975.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079eb57467b9---33178907301.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/dc02c3cb9301c7e30a031edd083ae82d/fenizagi.pdfIn PDF document text
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/jubulupi.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/tigopiwefonol.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/86863922855.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/df68677f408c8d8c3efeae5a0c11ca4f/35470905251.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d9c0652d4---nuwelem.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_off00010eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB0 16348 bytes
SHA-256: 79ebc5f06aaa9d470448dab014bcc39b21b160cc156253b822db13aa63af627d
font_01_sfnt_off00013954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13954 11052 bytes
SHA-256: 1c6c45a48df5d77662e10c8765349f3355c50950bff31e0f7507f35b7ce8630b
font_02_sfnt_off000152d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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