Malicious PDF — malware analysis report

Static analysis result for SHA-256 8635650ce2e4e2e2…

MALICIOUS

PDF

88.2 KB Created: 2021-08-01 11:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 60bd2fffaa5412377340d94066f45c00 SHA-1: ac6b5069abe2e36155891714bbf6cb7870eaaeac SHA-256: 8635650ce2e4e2e2923863741f2f0841604d0a51e80eb03787c4f5c4433059df
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a link farm pointing to multiple compromised CMS uploads and disposable hosting sites, suggesting it's designed to redirect users to malicious content. The presence of a 'download button' lure further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sam-global.ch/files/file/96901475473.pdf In PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff16d1adff---koketonozarewojofawo.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/92d88c364e9a7e332301f3f2586e0f02/8067695624.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/07e163088b0e1a04ca10b948c513756f/solasewiralajibagu.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/rojudonunegebu.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091bd9fa11a6---25539253464.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/b958295777fc8eca5a896587d318ce3a/34981438728.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/o3rcn3t6n8vsqpq3ukd1p73mnh/55398643965.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88288a116---44198097472.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/37002433001.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/sewemijimugazi.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/25395640681.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/pikaba.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/bopotafatevofufavopulinul.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/14497957243.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/12474884484.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160702d2f5002a---70324679554.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0a2593263---81900337006.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/5nsd84tmu4sj1egemf9t1l9f0i/wiziripemokekuzegasevibim.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/38afb5c7fe218f2c30355db958f297d1/42518150805.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/tewupil.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/02d909c2262c6983cd9349c129939592/naragel.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/72521931223.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/85159668815.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/sosolevumevijeliwalar.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/96953498308.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/tapuxoj.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/wagigudupuvoberusip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=gta+v+pc+rockstar+activation+code+already+in+usePDF 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_off0000f2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F7 10916 bytes
SHA-256: d9697b8917ce0e8bf26e60bf9626824b9560f8952369a8ca33132cb0fab257cd
font_01_sfnt_off00010c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C71 17820 bytes
SHA-256: e2a6738b2b86fdfc86a5bafdae54cab2106735d43f9b9fd7392c6f7e3ef1326a
font_02_sfnt_off00013a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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