Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf918239228a31f7…

MALICIOUS

PDF

75.0 KB Created: 2021-09-13 00:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 6e8740f2d01f39aeac1ff88901269b2d SHA-1: 103deb9846d29894548867e03f3585e3fa5eec7d SHA-256: bf918239228a31f7683a8036310a2ec0f89499aefd3619afc9fffd07c078c52b
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://honyi.tw/ckfinder/userfiles/file/sumolataf.pdf In PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/43629244469.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/98641677817.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/20017437110.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/75083402035.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/97105646818.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/65165610431.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/pumefumubakam.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/guvale.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6c39460d7---pofodumitinavozo.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7313c3cce---vidojajef.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/wezisaw.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/67878899261.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/58201638733.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/siruzozigosusasivemevamil.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/85334436959.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/83197507210.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/24999048029.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138c1ca119d4---nifowow.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/9719958732.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/befotezivuxewogefuwemezaf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375caec9a10---73323841292.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/walemivuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=first+aid+usmle+step+1+question+bank+pdfPDF 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_off0000bf2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD741 11164 bytes
SHA-256: ff447d0a6c028a41e3b5c21f9b927aff5c326bbeca1fc23bc14f002ed33db3c7
font_02_sfnt_off0000f0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E4 17296 bytes
SHA-256: f3c4cb6db009f7c6182e964d28361264a89839dcb01dd5b3d7ffa7e9d31f77c7

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