Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2ef2708c79a9d9f…

MALICIOUS

PDF

80.5 KB Created: 2021-09-04 06:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0612c3aaf11a5dda9cacbc5ad0282470 SHA-1: 30cf108d849e8eb13da92ce5af0f0c4890a29ead SHA-256: f2ef2708c79a9d9fb249728766e732a8d5ff45a97b015ffe5497500edf93035d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with heuristics indicating it functions as a link farm. Several URLs point to compromised CMS uploads or disposable hosting, suggesting a malicious intent to redirect users to potentially harmful sites. The ML classifier and ClamAV detection strongly indicate maliciousness, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ferado.vn/userfiles/file/32394414261.pdf In PDF document text
    • https://pacantioquia.org/aym_image/files/73522254908.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/38680408745.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b02286e79---muxarosegalagubajivi.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/71944896052.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/dununopovif.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/42478996762.pdfIn PDF document text
    • https://everestart.com/images/stories/file/45440760873.pdfIn PDF document text
    • http://standdominica.org/files/files/bafoboxemif.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16086857cb87c7---71472412343.pdfIn PDF document text
    • https://ridersshop.it/file/29044932961.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/jewizugejujonidinomakepo.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63fe6a094f---boxugofomuparejujenifubu.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/kedewubetoropewevivireg.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/54103256498.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5803cf2322---gosakugoxabumu.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/mabezik.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/zibakekute.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/93856022725.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/64865007716.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609717c4ef921---96512260152.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/seromofutixokesama.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/5830f05cbb4476a61c961eb880dfde46/6917068444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=verbal+judo+thompson+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_off0000d5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0E 17448 bytes
SHA-256: e92a16d9bddbd9c2b90cf656825b47ec3166f41c7ce4285f4f1701740edc7274
font_02_sfnt_off00011b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B13 11008 bytes
SHA-256: aca51efc00b4e1520ec53cb8a9278b38dd8a740308f6ad1b3dc317ff608cfbdb

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