Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ca2355c934bbb3b…

MALICIOUS

PDF

118.6 KB Created: 2021-09-04 16:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bb90f270a3ddb5e2726caa266415f985 SHA-1: 12e8f9b0667e690c6732abc73679e39f2128a695 SHA-256: 1ca2355c934bbb3b7e2ee2d4f963f9c33a90f8fd46a5dd6bec45a3ece4dd94f2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or utilize link farm techniques. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to redirect users to malicious content. The presence of multiple links and the nature of the hosting suggest an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://warsztatgdynia.pl/app/webroot/media/files/jodudopomipi.pdf In PDF document text
    • https://distriparkbotlek.nl/userfiles/files/sutusevibejevizo.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/pemuvanep.pdfIn PDF document text
    • https://frpeteradeyemi.com/userfiles/files/tusavezakobalulu.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4a9a18988---netewitupirexor.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/muruxedurizabarubiluwur.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/suvitaxukud.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/28847078391.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/50621830412.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/48723979666.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608452f59704d---sijemazefofesigawumu.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/rutoromeji.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/dd33fc87b8932b6dbed5a8260f87c692/povitogutago.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/84008073802.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9397a7feb2---38839711625.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/zivelegexokidixuxeler.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b18fc8339b7---fapamotiwatowisajijov.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/32049261852.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/pifobasozomed.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/36989f8047955c9dd3a75b7f2c59a2de/14725991775.pdfIn PDF document text
    • https://daismene.it/file/jubilop.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/vavatopufiwaw.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/73544426278.pdfIn PDF document text
    • http://moretonassets.net/userfiles/20598657600.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef77fb572f---pulokumikelezonaderida.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/geroteliti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=what+is+matrix+organizational+structure+pdfPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210825/16298770018434.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_off00016766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F7D 11324 bytes
SHA-256: ec750706e98f4ca9635a3ff1fac87c362e866783ff914d8e3a7593b4c42eaccb
font_02_sfnt_off000199cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199CB 19160 bytes
SHA-256: e607eab1f855fe59e2bd979d94f7e6cd548443448c480acc06c68cd62790c80c

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