Malicious PDF — malware analysis report

Static analysis result for SHA-256 607340b58d2923cc…

MALICIOUS

PDF

85.0 KB Created: 2021-07-01 19:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 36a359dcb459bd3841c019df37acd53e SHA-1: e32a6c1614df8852c59151c98e1664f0a48557cc SHA-256: 607340b58d2923cc8c865217f82b5b7fa960a467f8683f36bd13fcdc922f7056
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phishing pages. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a malicious intent, likely to trick users into downloading malware or visiting phishing sites. No scripts were extracted, but the overall structure and heuristic firings point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • 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 https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/175c1be8a82a737a561c1958bfb30fca/26941947622.pdf In PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/srd0lage3ov46g5f6c2iuuc1je/pezarenogovana.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608760f8cd34e---37997741500.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8256c0301---venoturuvuminejejepovaj.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c666d3577---rulonopafexud.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/46312610794.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/55384178611.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/rozaxaguxanawo.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7cacbd14d---14266683641.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/rifomodopufuvezawef.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080ee8520580---temoxonaromitexaraduniwig.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/somutekotugemakis.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f413b2a154---sedizofitiruvovomujal.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/kuzisazebitaseteno.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/vinag.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/21024034759.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/sumozig.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/2df1c41b974a407c7bfb532b54339f74/56814273609.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/0aa47187f0b4690a3723f3de1e5006e3/3514999944.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/2820967ee66cecf27fec574d7bed0274/wowaxazuvixew.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/39194417918.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff2804bbc1---69378655931.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/jujisuzilomobiginizas.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/10870808838.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/f57860be06db75b723499146121d9128/89677559714.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=cute+pdf+to+excel+converter+free+downloadPDF 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_off0000e974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE974 16928 bytes
SHA-256: 8b09d2df445a58c92af841f1305c9f2f4e6803039e61f30b4b086c679b91d3d8
font_01_sfnt_off0001157f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D96 10740 bytes
SHA-256: 5db336a1a1f9c464e5ff516e0793fbe048c6f14ace79e1f397399bd52f5d38cf

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