Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a648baa083fdf80…

MALICIOUS

PDF

85.9 KB Created: 2021-09-15 11:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d910a6a02ab7435fd7b6f53e9b150715 SHA-1: 137f2435ed10f25d4bcf290ab9b22eef4e595d29 SHA-256: 9a648baa083fdf803b4eab307dd1dde17ac44e9fe635d24a8b76ea4de4c21995
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains embedded JavaScript and a significant number of external URIs. Several heuristics indicate that the PDF is part of a link farm, with many links pointing to other PDF files hosted on compromised WordPress sites. The embedded JavaScript and the nature of the link farm suggest an attempt to redirect users to malicious content or exploit kits, aligning with phishing and malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=new+indian+movies+on+ott PDF link annotation
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161417d0da1a34---79661844416.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/xegobimiserowafulojularaj.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/30044103790.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/xuxaresepakate.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/linufojuruxiloguxap.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/bb3a183b29b3694dc487a1814a016157/buzetumi.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/43498200028.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/fibegivigikufejuxis.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614114e55940f---50213810735.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/lovixu.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/8503a74ab290dc35942d60baf171239f/xenezunalexejoxep.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/54061154096.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/vubilel.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/37605472077.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/v5jg89j4i3ekj9corfa77jqpll/xolabelipoxami.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///dukeda.pdfIn PDF document text
    • http://elpijisystem.com/file/dosibumojanolese.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/65509132667.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/52494261975.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/24015314920.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/jazelesavuzawevuzox.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8409a3b56---wowubuzu.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339c7f3379f---dexibazipus.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/figowebisinopeminax.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CB 10392 bytes
SHA-256: 604d901220c05974ec5762151e4a9e841e7305397cfb408326a1b47c810788a8
font_01_sfnt_off0000e962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE962 18136 bytes
SHA-256: 55446eb24721bb49340b26f11552caa06de606e99d2642ed068e7b45408c8ee6
font_02_sfnt_off00011843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11843 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13054 17308 bytes
SHA-256: 59e194ef199f2d8d3561d830ac47e39b9b6c32126233ce4757b151da62c21723

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