Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab0316ed322af131…

MALICIOUS

PDF

82.4 KB Created: 2021-07-07 00:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 571cd6b9b66203b68a25de7ead64cac8 SHA-1: 4c84cfb482819b7ac7eeabf72234790daa272d3d SHA-256: ab0316ed322af13148f2111d78a0e199324bf8bcc6e6df5ea97a99d94c2fd98b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. While no scripts were directly extracted, the PDF structure and link farm heuristics suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0e5dd54f9---54900863683.pdf In PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096aed1763c2---1356748536.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/itc3smhfd8eclmu9s7gtahnbl1/94806701422.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/96e952bc06c5ea3abeab5826c15578a0/wubusuzaka.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/36b0798e8ac825a166f77c3aea9e6079/91758283997.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6f64be499---84854606002.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/wajipasoxarakipu.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909f0c95aa4---fevosivapibulosuwaresoz.pdfIn PDF document text
    • http://buildinggodskingdom.com/webcms/file/35773082750.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/rumudov.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/54116515807.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/xopib.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/20664674070.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/64625975282.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/94d6abcbeff91ed247ef7a427e330a6f/56136819525.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/sofowefovagumuvonepejini.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/33876733251.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f8b754d2c---saboxejuxogowebipe.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/700457325.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/d03b1697bf1ff6961bb000307dc1ec51/50922775611.pdfIn PDF document text
    • http://cuacuondaiphuc.com/upload/files/38342202754.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784c8250cd3---48789173631.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/s9vs95jvidee54mqhkbavgehg5/86663573603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=powerful+praise+and+worship+songsPDF 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_off0000dbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD8 17560 bytes
SHA-256: 666b8a22987e41a2b20c8ca5c290bdd169412f3e548aae277a048cb8b727ef84
font_01_sfnt_off000109d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D5 10868 bytes
SHA-256: e70e6b8b7e738d1aa9d321648337dea2f0beb3616e08683ea3a9de35f669fcf3
font_02_sfnt_off000122b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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