Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec8fe46ac656815…

MALICIOUS

PDF

76.4 KB Created: 2021-09-12 00:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: bf3121e9ed671b86451d374c64332649 SHA-1: 75f10b2aca6754fca513984d0203a048a577c1bd SHA-256: dec8fe46ac65681548e223e830568e9e5eaa41fbad9be4de898142f078bdbb24
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to various domains, some of which are hosted on compromised CMS platforms, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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://phnews.ro/files/file/gunamujin.pdf In PDF document text
    • http://cascad-trans.ru/files/23802491734.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/091125437056.pdfIn PDF document text
    • http://chengzechem.com/upload/files/2816605092.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/xosidukin.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/1625704812.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/kafaba.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/90254652354.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/18810221120.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/78135905763.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5b97f419d---xufolosutovew.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137bdb814d6d---38645789904.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/12065891951.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131db369cae4---20335721863.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/8739274834.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/bisitulobowawolivixuzuseg.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/pevowuvajubojivowezak.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/wavalabesezipekubogoku.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/vejoxomixix.pdfIn PDF document text
    • https://cargobull.cz/res/file/53211430520.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/meneka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=android+program+indirmePDF 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_off0000c631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC631 18068 bytes
SHA-256: cc42695afed515e67de0e8441a3019e885b3da9c30fb574c09cb0f7e66e7a9c5
font_01_sfnt_off0000f4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FE 10404 bytes
SHA-256: 4d3fa401f41d373b9e2ab011ec2133eb90cf2293ad3c24fe7e6a40985f43d987
font_02_sfnt_off00010c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1