Malicious PDF — malware analysis report

Static analysis result for SHA-256 34c6b4ac5fd1c887…

MALICIOUS

PDF

83.2 KB Created: 2021-09-03 00:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8c1363878ded6688b04e10c7c21dc9f8 SHA-1: 004ff0811bc3312d3c02a159c7fc878a16f79cb7 SHA-256: 34c6b4ac5fd1c887e88120f78cbd59081a3542daadf534fef4c52698e7f97eaf
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and numerous external links suggest an attempt to lure users to potentially malicious sites, possibly for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1612babbfbbcce---19052073248.pdf In PDF document text
    • https://lawina-radom.pl/files/file/rafutopavisiwezabam.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/ditididanifapejizol.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-26/20210526145932102796.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/41769308507.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8667ce0ba---67412167526.pdfIn PDF document text
    • http://arcadia6465.com/clients/f/fc/fcac8d81e62e7f23ed02b02243def538/File/pabon.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c979f979684---matakelapinuzebusikajati.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/lonawanixized.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/g0pk737ifdat85sb83qkkecqbp/fibofametujedunezaderim.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077931164899---64099177807.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/d399305193fe608a4d556bd676e4d99d/10080952006.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/zimixudexavapuvajapap.pdfIn PDF document text
    • http://pololanna.com/user_img/files/zemuraxanuxomo.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161058c2d211ce---52009476344.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/tewesikofidapipivat.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea811ce9ac---32181832743.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/xarusexusir.pdfIn PDF document text
    • http://rahway1968.com/clients/5/53/53e48f2724afc57738bbbcfbfdbdad27/File/59084290143.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/kexez.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/346413816e6c5bec4864f6e5f53246b6/daferib.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/1627924221.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/zexavodojote.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/malusijisorunepu.pdfIn PDF document text
    • http://elijahlaurabishopblack.com/clients/b/be/bed082b287f5bb70db4763ab929fc18a/File/fowaxekoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=service+design+blueprint+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_off0000e1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA12 10896 bytes
SHA-256: ebca321068128ba362cb5fe2b21e78b5eaa94223024778e17b87ca675209e17a
font_02_sfnt_off000112ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EF 17064 bytes
SHA-256: 24a77d392dd460b55e2d8bfa44d296d87de2a9cdda9bee30300aa5abd5379ad4

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