Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ec7f5a53094b8a…

MALICIOUS

PDF

68.7 KB Created: 2021-09-29 14:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6d1bb9e2fa97a86d42a71d9e23691f1a SHA-1: fd57733b626fa3a5920c284ccaaca8228fa28b7e SHA-256: a3ec7f5a53094b8ac7a69cea40d31905e2273a440c1aecbf126fda797923e6b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a pattern of using SEO-optimized links to distribute malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=what+two+colors+make+orange+paint PDF link annotation
    • http://ip-golubev.ru/ckfinder/userfiles/files/42044913259.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/99012713083.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/givajiritozarevunewasino.pdfIn PDF document text
    • http://client.diffuse.info/files/getojavepikizoxedi.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/ruputapetasuregawunufafov.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/d82de22791a6ecd522e8de1c48e75e77/lodojokaz.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/bifazekojoloxokerotisuri.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/tamamiketejerigoke.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/71218075251.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/gedur.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/sufib.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/tekixasiwowavad.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/98638451425.pdfIn PDF document text
    • http://ruihuitax.com/files/file/fanovixijosuzo.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614c79b7912d4---42471059785.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/vawegegegonedizirugu.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614ff94b18d53---lidarilogunukivata.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d0b948cfec---27243134342.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/53869737231.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1631898051.pdfIn PDF document text
    • http://chongros.com/userData/board/file/jetaxutebaj.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/xawekek.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_off0000ad37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD37 10992 bytes
SHA-256: 0d57c766a0767cb2dc941a3a60c04487e29712c85f86a174ee74fc66404483f8
font_01_sfnt_off0000c6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A6 15428 bytes
SHA-256: d3bc881edbb02a8daadd7d34972002ba53de43173a9f488ecf96a4b5230a5985
font_02_sfnt_off0000ed53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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