Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a9a58b0b535208f…

MALICIOUS

PDF

80.4 KB Created: 2021-09-03 23:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e5cc2b7d122858b00b78ec949b28d05f SHA-1: a1082da66f1ba256cf4f6fe51207ac55010d6686 SHA-256: 1a9a58b0b535208fd93c2b8f565d69de3af2e26b8600ee8f3ed2655d27492a59
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm. The presence of 'utm_term' parameters in some URLs indicates a potential SEO manipulation or phishing lure to drive traffic to specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://crewmak.ru/uplcv?utm_term=algebra+1+2+practice+worksheets PDF link annotation
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160740dd275820---81111562167.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6f1f9cdb9a47b5697c21297eb6af32d/gimirawibufonaga.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/bd6acb367fcf0a207e669f6ce16fa504/38246776737.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/63638547104.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce333c4559---6566085960.pdfIn PDF document text
    • https://mashura.co/userfiles/files/vujufa.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/welolabezavitazivupawu.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/64494323509.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/pesiwarafo.pdfIn PDF document text
    • http://packamate.com/userfiles/1922271451.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/28100652433.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6ec90936e---70576112371.pdfIn PDF document text
    • https://medtek.vn/storage/file/kanuvapikobot.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed26fe1802---98657317888.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a456f28b29---wivejarufideraxovunez.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/faxelitawavukip.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/60052589641.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/d6273263358dca8d21c6ad3ba07bbdfc/97368742358.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/48522286917.pdfIn PDF document text
    • http://nakakinpump.kr/fckeditor/upload/file/75910834337.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/dapuvuxix.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/13582214642.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/85897177162.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/nbmj0ak3e0ie9svdjpne07fu7i/vozovodarogi.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/3475462744.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/wezidobokosijus.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_off0000d238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD238 11020 bytes
SHA-256: 0eb20b69a3e1cd2e52663f94177d949f6038b2151631d8a751d0f2c0751173d8
font_01_sfnt_off0000ebf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF9 17736 bytes
SHA-256: 1313ce216371defea8d1448f94319a839ef77079a30f193729528caa32423e47
font_02_sfnt_off00011a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1