Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac3e8b914f11317…

MALICIOUS

PDF

82.8 KB Created: 2021-09-22 16:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a907564b33879f16b0e6a572b01c890c SHA-1: f98c54ba81a22b4e9b7d19640d09640d6a8f93d9 SHA-256: 9ac3e8b914f11317418f82d51df8381b6847344f5aa770191ff298b5f76e7e13
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to potentially compromised WordPress uploads and disposable hosting. The ML classifier also strongly indicates maliciousness, supporting a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://nomylo.ru/uplcv?utm_term=scan+qr+from+screenshot PDF link annotation
    • http://seamcc.com/UserFiles/files/jesadamiludadosupu.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/rekapojerutuxuja.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/motimegotu.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/77fdbc8139d06a9518531ac8159cb6e8/mopovofadofatamenim.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/kinoluvosizakovexinesape.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131704f63967---doxepepu.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/duwebemiridunekibat.pdfIn PDF document text
    • https://terracell.pt/images/file/86923360947.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/nirogukuwuxakoniwegodu.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///sabikozezazarevenulo.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/kefotexija.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/rubanixexarajeme.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161458bc132b99---48967947140.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/winatezifamefebovi.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/tikugaromizegejosoludor.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/tesuvasovedujomuwuluj.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/40510710869.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/tupanezaluxoguboper.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/92212124691.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/rufebanozuzujimovowev.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/gunofibigafekozoj.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/21888782668.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/d210addc8078d6b67efeff7c0f5eec57/fumuluteresosexinuja.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_off0000de05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE05 10684 bytes
SHA-256: 840b16e4cab6a8b541e25af32cf2898ec58b00cd63697974a7e19b1e4edd4466
font_01_sfnt_off0000f65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6E 18204 bytes
SHA-256: dec9639bcff6fef72a723a86134610844d1fdfcb6cdac76bb41120d97f30892c

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