Malicious PDF — malware analysis report

Static analysis result for SHA-256 f065a4ec3f6260ad…

MALICIOUS

PDF

82.0 KB Created: 2021-09-06 01:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3613334a8b7849a3f2d2ef7311df87de SHA-1: 99a1a4c4338b1e7cec37dfe34c2df93c07b63b6d SHA-256: f065a4ec3f6260ad6489cda7321d96b0ea4a3e84c288974aec716a9025fe4a6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to various compromised or disposable hosting sites. While no scripts were explicitly extracted, the nature of the links and the ML detection suggest a potential for JavaScript execution or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://wxhsbl.com/ckfinder/userfiles/files/20210627_184344.pdf In PDF document text
    • https://paidionresearch.com/userfiles/files/10540618647.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81f556ba7---pijunewilutulov.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4a647e815---vaxefosover.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/bisikefevuwe.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4948033fa0---mutevovenez.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c706439e53f---paviradikudo.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d6ff624bd---89815134687.pdfIn PDF document text
    • http://izdo.org/img/userfiles/files/gunagulinikexevanagen.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/monesolexe.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/44158186049.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/1a77be44bfe11fac7e5589adb4ed9551/fizisekubuwidavixamizifo.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a69eb34b2ad---baturelesimojuxev.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609496a965aa8---nuvogusirafe.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/xupexozujiwinebavozojik.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/82409983208.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/nururamiromijov.pdfIn PDF document text
    • https://bloomeng.com/uploads/kuvivixoxuxege.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/35335180518.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/butiwawal.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8ceaf070531cf2f9ea01c8068de749f9/fifadoten.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbff8ee367---jarinusajeb.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/21240175790.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/lofegabok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=pdf+merge+software+adobePDF 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_off0000db5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5B 17852 bytes
SHA-256: a95d958bcce6a4bbf439ffe6195caa9873a58af2513b599ab98bb13182438ff9
font_01_sfnt_off000109ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D1 10680 bytes
SHA-256: 84840852564589ca7a205207b536a0a5cf2460800021b223342b7af12f61cc1c

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