Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fbaea7274f32ad2…

MALICIOUS

PDF

95.2 KB Created: 2021-07-01 17:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2f502efc27612f8d954bf41d89ce4775 SHA-1: cf7fb9470a7000987946b9366a263707c27eb0e5 SHA-256: 8fbaea7274f32ad271dfbf98e3d371b87b648518e3392176ef2c1505c25ca076
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites, some hosted on disposable domains. The PDF's structure and embedded links suggest it is used to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://aptchasers.com/FCKeditor/userfiles/file/wufibufigemu.pdf In PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607592e14ae8b---vonuguvizetabebividezufo.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/64fa0a9f0657aba9c2a8dd3b9d58d010/wegelemefogulewe.pdfIn PDF document text
    • https://podimercrm.com/img/files/16816914528.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607afa875fe90---mujikes.pdfIn PDF document text
    • http://cityfate.com/files/files/69271179313.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe53591a7f---pogujar.pdfIn PDF document text
    • https://andrejc.si/files/file/44074449245.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/0bc50c523952470351434c872fdd3a94/ribajowavajuvoratasofu.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/7835072152.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/1ddb75525c9708dcc8cf297b9be78b2f/79245381514.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607000de92884---pixuramesujuzolumeze.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/1206620285.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16092d564a79d1---wufope.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/750715fbc68e62b2976fcc74bd71e34d/vufunevezatalesigike.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd4de7f6b9---56396854956.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/9iqt3r6i6l4ausm5vtf0j5svb6/guzej.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/98877554279.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d99e05bed---85044201876.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/jidad.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/jixifutawud.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160cadc3739c66---jevotomijasamefubo.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608355cf2e14a---83472966873.pdfIn PDF document text
    • https://murtenhof.ch/userfiles/files/josovolodutuzulorobuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=the+last+five+years+musicalPDF 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_off00011070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11070 10620 bytes
SHA-256: cbc1bb7ab88d6411af86844eb884a88359c58f61098f4d25c165829a5f89ae11
font_01_sfnt_off000128c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C5 17360 bytes
SHA-256: bdfa0dc34ab64205be0753c463a5379e209389bea9ca32a32366245fa13ab167
font_02_sfnt_off00015623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15623 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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