Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac7d12b6abab32f…

MALICIOUS

PDF

98.1 KB Created: 2021-07-04 11:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c591140bbdd16b4a4cb8902808b00726 SHA-1: 9fea3bf0d4c5c56f49b18579aee67164972545be SHA-256: 9ac7d12b6abab32fbe21f3510241febe170e7bf93c9639f29c3d550e7be863e7
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and a link farm heuristic suggests the primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://matstravel.ru/userfiles/file/19194460501.pdf In PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/hjh8gfek7utffcgrvihb1ahc58/1607244510.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b25957dbc70---pelifumediza.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/nususesupulamomilirakofo.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff28de21d3---fugisazusowuvixazuzem.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fad15683ae522ef7fe8ae9f2fa65d790/93476081286.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/xowufolu.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/38917426415.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085c2e139ca9---ruxoniruxuzi.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/7eeb68cee675e930f654c5e3bf8b911a/daropovuf.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/timesivijeku.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/6ccca97833c3b44ec92f74e030aaa91c/73227832773.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/11866936636.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/97129313f92778c86f26ce27bffe5195/dotemabili.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/e2ceadsafri66jv3ptm2fg14b4/43465440228.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078419c97ad2---47626251857.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/sikej.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/7ce071edb96381505d6d653ca6ba4d28/nekafiwosuguzefebelewe.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d73194eb9---25555591198.pdfIn PDF document text
    • http://ebal.ro/app/webroot/files/userfiles/files/xaveku.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/3nljmuqm21fjv1nlef1lme4fht/damigeveg.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/fewigekawoxamulex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=aborted+child+meaningPDF 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_off00011e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E95 17008 bytes
SHA-256: 489fb4f92bd7565dea0a2a1d8b3053428f88d7062817415cf9c1e9f836b5a2c0
font_01_sfnt_off00014b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B42 10768 bytes
SHA-256: ca9a94b8d005cc151d8981cac4f71eeff89b9fd8bab5ca1c343642fd872c08bd
font_02_sfnt_off0001639a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1639A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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