Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb94a37dbd6c3859…

MALICIOUS

PDF

66.2 KB Created: 2021-06-16 19:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9dc7e8278005cd43f4aa17afb161bf0f SHA-1: 416c8a981e70525727411771acafb817e764c2ce SHA-256: bb94a37dbd6c3859b926f579a1b027f9d940a74b4a878b90fcbced628bafa843
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

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://catamma.ru/uplcv?utm_term=ore+no+kouhai+ga+konnani+kawaii+wake+ga+nai PDF link annotation
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1607f817a3e536---zavinafop.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/jaravivubovafavopebuma.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/1baa4376b468a67e812c9f9766bda86a/14800031317.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c89c5f289ec---70365370591.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ka103fjfohdo4fbnf6dfppiec/peduni.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/5bbc14046afaf31e01714031d9dfb8e7/9816936518.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/b0ebb4a6ce54e1a9fcfd660925fbb617/vitemepudederuzuxidogus.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ae013602bc3---43690129834.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/2e724906beff99f5bdc2bfb47d5cc226/15247286761.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da317f2b4b---keduvut.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/0vf89l4oqv98aov88krm7p4885/xogoxepego.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/dideponusavakutibogatip.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797c91d3987---55275888754.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/fdc373c49d1da2ce10d2c3dfdcbb59fe/49945831616.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/lasude.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/0521bf2aa97c9d0136d514ef9ba84c48/29055463815.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/e9957d47c063bd425ae2f6bb53921365/zokubabinarenilokob.pdfIn PDF document text
    • https://cm.blazefast.co/b1/27/b1270e223b54b588d0a954c9364d3b8e.jpg,https://cm.blazefast.co/1b/a7/1In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC877 4920 bytes
SHA-256: 804523c43d2b8477b25b3479ed1d4596f8b5b48c34f2f4ff03ba79f741ffdfab
font_01_sfnt_off0000d941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD941 10028 bytes
SHA-256: ca2c6fd57f78dec6cf87782fc31593f0b4f66525a9b6f78c970a2ad4b4bd5ff3

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