Malicious PDF — malware analysis report

Static analysis result for SHA-256 68b67adb758a6334…

MALICIOUS

PDF

89.4 KB Created: 2021-08-18 10:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d2e25c8a4dd4f5f08610893515a14c14 SHA-1: cfa8f604da0b5e3f8c8f9d03d3910f1cdc2f7aa2 SHA-256: 68b67adb758a6334236025da9a4b4c787b98dab07e7eaff9d48e1d6fa9c51578
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to numerous external URLs, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised infrastructure suggests an attempt to obscure the ultimate destination or leverage trusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/subivekebojibodasujo.pdf In PDF document text
    • http://614move.com/clients/4890/File/47373651270.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f54a94fce3---64160166077.pdfIn PDF document text
    • http://vivalepurrexotics.com/clients/2/2f/2f65fe2011b8f0b07f64c29a74835a02/File/85181479048.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/zevizagojuwamepusuvipanis.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/86532974711.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fc22aab1a62---31851654522.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///rezefawid.pdfIn PDF document text
    • http://indecomavo.pl/inc/mikenoro.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/5265917627.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/1713359852.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c28a7db4ec---57566079754.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3b7a5892ca91c20b496f8702f124c16c/vosusij.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/4649f1fdb3a921534b8f8a715c3991e0/97170115972.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/0b7c1f484e0f02f2f2715dc5a6e723bb/85670835844.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/67601195347.pdfIn PDF document text
    • http://vucert.vn/uploads/files/18866121338.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/kujuvejomuruwopip.pdfIn PDF document text
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/15566538045.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/708a656b5d5da5d5d318a36abd66b1de/2962529275.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7b6e61482---31108037425.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/51684754040.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/jagipanuvizixa.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/3ebcuqdds6ggspvporv8drhes0/xowovuxetilepimikipiza.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7b9c9cfe6---beparobuvaxuvexudif.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928b9b8f203---foxefojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=androcles+and+the+lion+summaryPDF 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_off0000fa41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA41 16588 bytes
SHA-256: 29db486aa29650b7db70956e28a259375d7a64b3db4025c7a784b00078172311
font_01_sfnt_off00012481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12481 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C98 10832 bytes
SHA-256: 38762551f13fd8f7d2de172fe903dee1db78463f939ee3302d34fa590ce6b4db