Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ef2b1aa9faa123…

MALICIOUS

PDF

76.4 KB Created: 2021-06-13 15:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a1e4e03b7d77eeaa4636c1c988dd62aa SHA-1: 88d291c231cba88f0abc2bfacec0e4337ba64bd7 SHA-256: 76ef2b1aa9faa123810706190862b69cd69005712431caf596ddafcf5957c310
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 0.9998

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://medvor.ru/uplcv?utm_term=cessna+208+checklist+pdf PDF link annotation
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160748b48212f4---62389563814.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/dg2bo3mdq92gfbi0aca6scer63/pawabadutopubefevomofaf.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/7o1p0e96cfrh0hj9t0snnhred2/pikexunojekuvologu.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b4f26c588d3e033fc32cd359fdae40c3/76849310771.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/75669476675.pdfIn PDF document text
    • https://airshow-bg.com/file/61737580042.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/emrs0fbullin422oqv8nk1bren/40212822725.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b426fa4a683---89911705925.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/b83072adf06d94f1de1bd189e78f8854/rapot.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/rijajemaxepijavifejofeke.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/3771140bcca4e09b997c150cbe768a4a/21778088785.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/78884163401.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/82061616231.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad861231c34---67118497975.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8ddac0d1eb0b0d25966dc554a4742267/14803671636.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ac36123f6---busawujawenagef.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/a15m7k94grq34g8dghba9rb6d3/pezegi.pdfIn PDF document text
    • http://simonide.org/userfiles/file/37003398878.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/kiluzisobogonugada.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBC 5380 bytes
SHA-256: f845f8a09a3bf41da69465fab7d458a2256d698a4ae7facea1526d55ae98c8b8
font_01_sfnt_off0000eefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFC 11812 bytes
SHA-256: 17600b7ff21cf712ea629abc76dba785a3af6df9276b9c12abe165165813f1b7
font_02_sfnt_off000115c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C5 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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