Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9026bf2a658a682…

MALICIOUS

PDF

88.1 KB Created: 2021-07-01 11:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9b73d9bfa7973314e60adf8c49837e13 SHA-1: 0a2e77b09020b83cb5d34ad76f9efd89bd93b962 SHA-256: f9026bf2a658a6822889116dc601bcb9f6a01888b88bbaf2b5101a116dbb3536
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://smidgel.ru/uplcv?utm_term=how+to+lose+chest+fat+at+home+for+male PDF link annotation
    • http://shannonlakeestates.org/fck_images/file/vekaj.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bd438e134be---78416222893.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/iguch1ufo6io22qbd8plbopapf/90229311660.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160829be244603---43318661191.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/mudagogovawowimiximunub.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/potalogulajetunifo.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9573b511---gagukudowezepitazilofilo.pdfIn PDF document text
    • http://bscartridge.com/pic/59467582216.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/xutewozowelinazukoronadag.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/subipogelirasalev.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fcdcaf15c2a19ea3a6bc22bdc8719e46/vemivunagi.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/88250561014.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/litodewiluwu.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/tejodakogojosafofadomizep.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/makutokugix.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/jovifevoxivoziluwusorugu.pdfIn PDF document text
    • http://mckeoughfamilyreunion2021.com/clients/b/ba/baf9e6b347377fae0abe5a87436fc4cf/File/vedujiwotasakiwopeveboto.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b775c7376b2---90184941720.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a773e1210cf---84098834213.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/6c404636c280f86209c55b18b89b146d/kobabavifajamo.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/10918c7af5360fba6af1df6d4cd2f441/zalerapomesefekalevelavog.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/o5r6iegu5hal4e4l3si67gbhft/fexokize.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4a30675fd---5360740755.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_off0000f741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF741 10480 bytes
SHA-256: 73388eca1b1cb56687a350803eced91f6bffbef712880a3b278abcbf9a9e17ce
font_01_sfnt_off00010f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F21 16828 bytes
SHA-256: 0cbbb9451ea8a416d1434490ac24239cb3ae68d95e1fccbc41f2e8b21d69da7f
font_02_sfnt_off00013ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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