Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f7a4562b472bb5…

MALICIOUS

PDF

92.9 KB Created: 2021-07-02 21:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f29c01adedd6fa52d289f231c60e08f6 SHA-1: 0f39cdf62add186c6445a8a8ac81ed06a65bb9ca SHA-256: 64f7a4562b472bb5df759c4b1772b0afe76511f1be137786c18d55bd481af657
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The document's structure as a link farm, combined with the compromised hosting, points towards an effort to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://wastran.ru/uplcv?utm_term=notes+of+goc+class+11+chemistry PDF link annotation
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/2808808556.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e0010b303---vuluwupuveko.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945cbf0d9de---fafedawisokaxemiso.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/luvunuwumasonabi.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/77988810291.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/29d08595b8edd2cafd3e2a539652d151/wesoxomu.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160984b9d92166---52019579616.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/jelezuzikusizezaxog.pdfIn PDF document text
    • http://kino-cosmic.ru/sadm_files/tulosijizuzuviwelalojat.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/ruwapixugoleramufisovarix.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/5dffadde044da160ce5d13eaa0157bd9/82617361821.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210521021947844824195.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e35fefcc9---bujakanugotegepalomi.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/1iuco10raqpilctsfsqimdgafs/zavuwu.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210627164428_m2as2f.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609111de0087b---30788967073.pdfIn PDF document text
    • https://laser123.com/geektic/files/68568726547.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/65895133751.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/zumomibibudabiwuraj.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab12c935978---92608978571.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/4a74f145cb3cc4945379c62b36f6c6a6/zaxabazajetum.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202106211036499521.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9001ee8d2---74806873183.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/e630a4fc52ed355ccb8d627367ab1175/42337516937.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://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_off0001086e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086E 17928 bytes
SHA-256: 4bb42315d71d447b8b038a5a8ab7fd9e32081c0c42eed4dfbd929b1c712bf35b
font_01_sfnt_off000137f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F4 10824 bytes
SHA-256: 29b68490e0287983f6e9359d27b5716ffca1b5a0ad4d4d3cb41d1a6f3d778167
font_02_sfnt_off0001510f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1510F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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