Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b11c633acfb623e…

MALICIOUS

PDF

86.2 KB Created: 2021-08-21 03:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ba92d3d5d81dde238fce9251b811315e SHA-1: a2f2bea8962f3133f19dcfdda031707f1274093a SHA-256: 8b11c633acfb623e4bfd66266a24d25c22682efc3270c779b1c48539ba20c05b
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The file's structure and numerous external links indicate it's likely part of a phishing campaign or a downloader for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f6c809563---52864111745.pdf In PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/86993432700.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/10c1a5639b6085010efeae5b9c7ea179/14268456984.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/54916146509.pdfIn PDF document text
    • https://tipresentoio.it/images/file/xonalutila.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f8c198e5ced---66605483715.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/fljkbj25u5kkqababp16mg3jc5/76244721318.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/21683537522.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/tilusumo.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db22198cae6---52297568175.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/cspsn9degn251vboiapj1m19s7/gaxorozit.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/4i4g0qsd6l67n65neajklke3gt/rirupez.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/bipedo.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff5ef8720e---tapugutiwesuxusuxopoler.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f1f038afb---varemelotosegavokogipipo.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/38295614832.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f57f7d7e87---morisewusirem.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/gipemurebajafojurofosel.pdfIn PDF document text
    • http://beateromer.com/bilder/file/vumiwamiboxubizeg.pdfIn PDF document text
    • http://koala-al.com/d/files/54263025162.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/70732934523.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e448f8613d2---wesepiwonakawolilujikufoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=problemas+resueltos+de+poleas+y+planos+inclinadosPDF 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_off0000e53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53D 11028 bytes
SHA-256: 785182e300a7231a593a02f89dce35e2081b9baff9d68eb04998cf63d995a4d6
font_01_sfnt_off0000feb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C6 20020 bytes
SHA-256: 8c010e174a3b6fd7bcf12ee42c7a04b28b7ce4246ebebafb175dceb1deaa80cf

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