Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4635398ec3378f3…

MALICIOUS

PDF

113.6 KB Created: 2021-06-13 12:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: d97eb77c9b4434a7cf06a95a80ccacce SHA-1: c242ab244fb19921739d5cda139a862c8a1d6421 SHA-256: b4635398ec3378f3c61a79df6e2f7ff7b3ebab4ffeb928f319c2846ae332c0e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=vada+chennai+full+movie+tamil PDF link annotation
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/9mfeubfqbas3ssunn7alupqve7/44284456689.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/zukivejame.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/tatuz.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd34c141e5---kubosefuludoso.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/86iguvctbiodlsulhghqn0nrj7/fubimaparojibo.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/38fb33bf01bd8c3beb01b23f04bfae48/poduzarerig.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/6174309932.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160846ed27302b---70381120525.pdfIn PDF document text
    • http://termocity.by/pics/files/depin.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/89737851388.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14a6c9cffc---newomibutuzafimokowiket.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084315f0427f---20891916857.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/dibet.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/19543870394.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b37e69df6---48124422078.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/fe87b79821be96bdbe78708c76ada69a/95467665329.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16076a6284bc0d---22285886184.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/bku48g6c9lq4kkndaqenldvk4o/naxilevifori.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.daltonmaag.com/In 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://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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14734 4892 bytes
SHA-256: 5d7064962d58ff3d7148f194a3c5c76b00a5e92d253ae86635629d9818dff5a5
font_01_sfnt_off000157a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157A9 7048 bytes
SHA-256: 6ac55efef6e6b5d711d75311cf6b0608ba91f5bce1a95faf92d0b44f990c7fde
font_02_sfnt_off00016c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C47 11796 bytes
SHA-256: 832639aa0e19af567bf049027fbd62db16dbbaadced920630a3dc2ecda1a8f36
font_03_sfnt_off000194fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194FE 16164 bytes
SHA-256: e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6
font_04_sfnt_off0001aa15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA15 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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