Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ad23eb8e418ff4…

MALICIOUS

PDF

81.3 KB Created: 2021-08-21 21:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b8d2c5a9282d06496cc36ba3bf001e1b SHA-1: cebf0ba12b9e8d9e41da380db84867f561f68e61 SHA-256: 87ad23eb8e418ff493f5dab106be1a80b7c510807e9fc6dbebd80b775a51aaaa
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting it acts as a lure to redirect users to potentially harmful content. The presence of multiple links on disposable hosting and compromised CMS upload storage further supports its role in a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/d58098a02dcd45b1941efbbd61e439ac/29413637524.pdf In PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a25914333e7---fedulitumofular.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607909b4b245c---94890837643.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/f8dc784c6b8e9d1578deea32f18b3927/rusabuwanitakilemezinam.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/kotaweban.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/guvalabelebataja.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/bedaxe.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/pa3dtvpkulusuloe4om3c29oae/31425763234.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/9502c7e97a44aa97c49febcf224cfc23/foxejafusawomefewi.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/sitejuvafapezanopuxuziwos.pdfIn PDF document text
    • http://wirheiraten.de/images/file/zusem.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/13744223297.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da1747dae0---xutifipuwapexolixazov.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d08f5a7736f---dibezajokitowisabo.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/bimovilewalogewovikig.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/zaxikukikelonoru.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/78561398506.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/16762379219.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/xifojebagupox.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/9c6ojm2ha8bt1gmkc3hrg1dg35/89791501973.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da5893ae85---13084842394.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16090ab38aaeb5---zenusomijumiruw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=livro+de+imunologia+abbas+7+edi%C3%A7%C3%A3o+pdfPDF 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_off0000d1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FE 11520 bytes
SHA-256: 0a270658245a9525a95e62b4bb6bd178b338bd3f4e0ae2478683dd27c5b080db
font_02_sfnt_off0001046f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046F 19268 bytes
SHA-256: cb489e8402d3197d098a953c138d28e28ec151601dda187c1df4b52f4fec0a38