Malicious PDF — malware analysis report

Static analysis result for SHA-256 133676cdfa4afe8a…

MALICIOUS

PDF

77.5 KB Created: 2021-09-20 06:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 72649aba5cd7105a888ac56a52cbc2ab SHA-1: 37ef4dff0678101aa4455d2a676cc5603ee8a000 SHA-256: 133676cdfa4afe8ad5fd16a1167110933443dea4453616603c1a444df0718429
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and exhibits characteristics of a link farm, with numerous URLs pointing to various domains, some of which appear to be compromised WordPress sites. The presence of embedded JavaScript, although not directly executable without user interaction in this context, suggests an intent to perform malicious actions. The primary attack pattern involves luring users through a deceptive document to click on links that lead to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://wastran.ru/uplcv?utm_term=poke+fight+mod+apk+unlimited+money+download PDF link annotation
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/likolutimevumipuna.pdfIn PDF document text
    • http://llux.vn/uploads/files/75975420592.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/34900829845.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/67087291890.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/welasusagijopazawokezejab.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/40067743216.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/ujo3dk36si8ti66dorvv12hjlh/34559844025.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/67831303450.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/najodezusu.pdfIn PDF document text
    • http://deltools.com/userfiles/file/58839178322.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161377f288df57---50867007191.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/01a746e41944af0252366b70be717924/renosunaketenukatuxojimeg.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/fejugunanusubep.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210917_133752.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/koxiturajitonotuw.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469f9e2e828---kasepupusapuvodotebaje.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/8868701324.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/40667858895.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/purerububanududovomunugam.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/tepez.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/21255568413.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/kelopaxok.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_off0000c876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC876 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE088 17980 bytes
SHA-256: f7110e48bea335ca3f54d770fb0ca79df6a6f09d114b577b4496eae449daafe7
font_02_sfnt_off00010f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F12 11072 bytes
SHA-256: 8290a534da4ddba58d25fc66a4c826f46ea4e71cc9ff15b45381c76c32155cb1

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