Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8676c16369a672b…

MALICIOUS

PDF

92.0 KB Created: 2021-07-22 21:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d0a617b0c27a2f516401780351f8d85e SHA-1: c7e08d2c787b19c469d2cc17c618d3fe47167281 SHA-256: b8676c16369a672b3971f23459ce2a41983378aeec6b030757f5ea7f7ec27156
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to redirect users to malicious sites. The heuristics indicate a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely involving phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bloomland.com/sites/bloomland.com/files/xevevavozipo.pdf In PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2837ab34c2---59975525161.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/65998177366.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/4df562c40d413b7eaf9e3833ce11b944/2182298834.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/11943900110.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f1923d935---83707636915.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/xaxenexuwadelurewowos.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/wovokidalolapufi.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cba646d88---78294677394.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/597a4b54e92c041243acc1e7637232d3/rigolulekejolefofiwu.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210704021204.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/89032323854.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/a4b81d836a6ae96f659da1b427a8733f/pikuzozejajutidobawove.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/6evcfj7dkrt3nfef0i25k3ufak/14741949162.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a731cf78f71---zanevasefekubav.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab43c02552---96631409689.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c396b749394---rorukojadajepagoduwederez.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/bdd01658987cd71f4d3d1001bb79f40c/63836275756.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/73258917114.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7d006fdb3---melifamerufipa.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098432c11def---47853284650.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/abce163ff2c1f6dfc12c41a723c36efa/depogawaluzodijol.pdfIn PDF document text
    • https://promise-land.com/upload/file/50689341419.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/vaxidukeniwo.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab5ad206b0---baxixadedu.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160947781df880---45303278540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=haricots+verts+wikiPDF 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_off00010323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10323 18352 bytes
SHA-256: 8032b60262c0b86dd3430b1b391765199fcb935eeff5f88142916e1f16668727
font_01_sfnt_off0001332d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1332D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B44 10308 bytes
SHA-256: 354e206261c64c28be9b9d1518cf7df245aed652f2954438f5fa2c283f6d5ba3

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