Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b3f852cd96efd4…

MALICIOUS

PDF

85.0 KB Created: 2021-09-04 00:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c2505b263640e916fb66291f98d33e35 SHA-1: 092d3846caea331e756a1df2cbd9e55b2d39bfb1 SHA-256: 73b3f852cd96efd426e114d2fc0bf105a9a36855935fb1e196245a24096e258e
112 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised or disposable domains, a common tactic for distributing malware. The ML classifier strongly indicated maliciousness, and the presence of link farms suggests an attempt to host and distribute malicious files. No scripts were extracted, but the overall structure and URL findings point to a downloader or dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://riviera.az/userfiles/file/rifoxawikozod.pdf In PDF document text
    • http://sosnovgeo.ru/userfiles/file/ruguzubaxur.pdfIn PDF document text
    • https://stbenedikt.ch/userfiles/files/nezajutapileziguduzezise.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fad76d9ce7---panofowogokoxif.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/butetepetixekuzobu.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/46622076952.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9561079dbb---69645791342.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/nilovobo.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/80b1d4510eae27eb4d6ca88fb5d889f9/gejitodosuwemara.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/bopojetazevan.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/2aeb211befef5584beb6d72db4085d89/vapijipimaroxifulomupawe.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/cc6ff6231a2446c6b653c7fab2478c97/zowapirowow.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/nobeflsi3n7scovii9sq2veis3/foluxerezuzoxenatulosixu.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/1265600870.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/matinutapupumep.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/15995726587.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/87208290231.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e373c4b1c---42033830750.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/pegepumomufifirememije.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/5t3rlh48kiv8dajsddadd8hni5/fadinozelijutajevuweriwif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=yankee+doodle+piano+sheet+music+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_off0000e5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F8 18052 bytes
SHA-256: a808667529ca27dc7dc1b9a307a7f11f96a2f9f0dd740863431f108cac42d42c
font_01_sfnt_off000114e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E5 10960 bytes
SHA-256: 7e2c20702efc8c54b7f7731df22b5514f2f580a11735bab002401a3e1a63c324
font_02_sfnt_off00012e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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