Malicious PDF — malware analysis report

Static analysis result for SHA-256 5821b3241120e641…

MALICIOUS

PDF

72.8 KB Created: 2021-09-06 02:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f0794d37e6e7427ed2e86e99922ee591 SHA-1: cf26dc8b85dcb6e6f5b8c70fc090bbfcf0ceb4f8 SHA-256: 5821b3241120e641d5bd5221bc74e5445d6d0ce90045750f77cc90e9c1f5e46b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and numerous external URIs are indicative of a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://queure.ru/uplcv?utm_term=ingenieria+mecanica+ucr+pdf PDF link annotation
    • https://pestresolution.pt/site/upload/file/12330194577.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/rezakapitogubekofopukex.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/80686844865.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c426fe7b1e0---59612304700.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/48528649589.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774802bbd06---nakitinefezil.pdfIn PDF document text
    • http://rivucota.com/upload/files/jofeweposokamore.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6fdd39d6b---vegunudewumofirabavib.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/lukilakedole.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/c70387b9ca0a528e5b0da8c58e197dda/teguxu.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/nisexadabubawek.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076a5653b9ef---redukap.pdfIn PDF document text
    • http://simpelms.nl/userfiles//files/lobigugirek.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/88007150890.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ba811798eff---peginilez.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/6162702089.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/sekiduzenisif.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/fokitaxemolup.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/fidopuritodov.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ptqsasglqhp2r1i3qk8v0cgtb8/tadepojutijufesifom.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/46946200412.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dec21b01b---24129580625.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/famedazofizezisotudexur.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_off0000b9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DB 17692 bytes
SHA-256: eb82610144d7895b5f65997f8b250756cdd196860b71edf9076fe45cee512a9f
font_02_sfnt_off0000fdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEE 10580 bytes
SHA-256: ce5b101d786a7436560bd5d414d89e9ef0601442f978b549e3149adf713ac9ab

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