Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff903ff19aa3904…

MALICIOUS

PDF

80.6 KB Created: 2021-07-07 16:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5991ece9676d3c63cc4ac55a6eb35fc0 SHA-1: 9ea9476e8aa96e5b113b93608667498b1111cd91 SHA-256: dff903ff19aa39043cd46e1f9a1a4a82704ca14bb241828250b471f6fa6ac681
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the numerous embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/9pnuh2nm7plcj212ckb0jbndq7/66996599046.pdf In PDF document text
    • https://audit-advisers.com/userfiles/file/29553049227.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/74529833019.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/najamesatakufov.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/139be1be6d6d8320dd3af0be39e06d7b/nerelubofopawipezirovobar.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e81ed3242---91788574960.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4410be201---rulonejosafi.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/nugafi.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/dululisasoreladomodom.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/b3513cf2ea9a2a6b6e133aebf7884fd2/vetefapifaduxasaxeni.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/rumujavanij.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/2527f5eeb63f84e4bac75e752934881a/fototesugasukopugonuram.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/bef7959d0b779fd1cc687a173c5838ca/jowejagibe.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/b4b5b43af09cd02f597168c098a0fa5b/55575839843.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/01kk0ge9i9dbvpumvd96svkc18/22275312845.pdfIn PDF document text
    • https://tavio.ru/files/file/nakozuwoxe.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/xomagiwilimasuw.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16080c74237055---kapuju.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/linifubikulovo.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/jomaponibuvujudirusu.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/bimudimexe.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///77197993534.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc09c6d1df---15243242301.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=morning+offering+to+the+sacred+heartPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e336ee0da4dea692e7b3c03d885e1beb/15478388642.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD696 10704 bytes
SHA-256: 401b2de653bd27049254c57f82c810fcb091162e248293ad1cb6ac2cd1580146
font_01_sfnt_off0000eee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE9 17068 bytes
SHA-256: 9db2bd7e521525b73d609e5579b1e3f3dbe143194c28313face0e7f4b5f992c1
font_02_sfnt_off00011b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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