Malicious PDF — malware analysis report

Static analysis result for SHA-256 335bcbb8f2806fe1…

MALICIOUS

PDF

93.1 KB Created: 2021-09-20 12:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e22013fbb5dd70fdb304fce775f1cb7a SHA-1: 01c76b56eee430befb60a1e22d2643c38efda34e SHA-256: 335bcbb8f2806fe1f3be0c9ade12e2f1889a24bde850642386610c16600e37e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting domains. The primary purpose appears to be directing users to potentially malicious content hosted on these external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/515f23adec88d059fdaeb94d6eba2d78/8065683498.pdf In PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/0a79c84f9081080ef036877b6b4a8e9c/2248427112.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210911061402_0bmkw9.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/63836385135.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/11501951230.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/58f7af1e40676adcf74a177866b5f809/vasoxosadunoxisogomuzopo.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210907_2C13D2C7D4E7CA8F.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/26290c0b3b6617f82bbeb8c52d69b2f7/sarebamuxesemo.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/32249573941.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613285b72a373---pirulegibokono.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/44536956339.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/rorebi.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/tdg8hlvtlr6ielk0odlpci4len/dozivi.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/92042379190.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3122528126.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210902130412.pdfIn PDF document text
    • http://retailcop.ca/files/geteg.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/modej.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebec75a866---5036207480.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/jutok.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/80262256349.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/94635146932.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/68026437993.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/kufinisigonosefodofuwazaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+use+custom+font+in+android+studioPDF 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_off000104fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FA 10768 bytes
SHA-256: 5949879e4bec400afc9593a1f58862a349d1986d069ce950bd51e1f50ed966d2
font_01_sfnt_off00011dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DF 18668 bytes
SHA-256: 1c191965042215ef3c36087626de192a982773036898384efe9dbf0c0b45d894