Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd31c184dc24bdc…

MALICIOUS

PDF

165.2 KB Created: 2021-07-16 14:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cbc7d14e853b7575b648ff3e56a5b198 SHA-1: f5214c2c0b7c443031f4444a47a5cf07ed390851 SHA-256: 5bd31c184dc24bdc4eb0f1d74cacf9972fec9cf967b35555e8949d3a0b3afeb3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

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://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1aaa8c607---nijimoz.pdf In PDF document text
    • https://ontech.vn/images/ckeditor/files/filinu.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/68179589804.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/a371f036d97a8ce2b0bd878e18344a43/1698073400.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609254dd9833b---rabolubexevefaludit.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/45496066157.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608125d747381---gujisovope.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/c624937096ff7a3afc21f01fe3db139e/33808248036.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/24753842106.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/25389957632.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/wevatufawerusosavokesofo.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/fekitaramobezog.pdfIn PDF document text
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/08c81bb05b4fb75e0f00d15f2e3a3d04/lezix.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd75e092af7---bozasabaniwov.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/tebut.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6757cc86ee---16348628448.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/xuguvexarabogib.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609886fecb926---kaneguzarol.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/dlc0oi1vpspvo18nms4jg5t1t4/62478429159.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/monuturaneraso.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16221907785661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+read+palmistryPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002128f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2128F 24236 bytes
SHA-256: 9941fde10772d658bef99f1a250d46b1a68eddc6ead965e045801af4e42fe784
font_01_sfnt_off00024faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24FAA 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8
font_02_sfnt_off000257c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x257C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00026fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26FD8 10640 bytes
SHA-256: 8fd8df12d0380015556d86101e00cebd555621b42cd0451d5ac4f9bba8400ad3

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