Malicious PDF — malware analysis report

Static analysis result for SHA-256 f09c46cd53a454b7…

MALICIOUS

PDF

97.4 KB Created: 2021-09-05 20:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 03a9df8308f1f50dc34b4d1dde465b47 SHA-1: f827d99df5ff0aabbc6ef685009a70c1d7557816 SHA-256: f09c46cd53a454b7cf7232420ca42be0a9f50d8d438d3555fbe053a1d97fba56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or redirection to malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9802

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://catamma.ru/uplcv?utm_term=decision+definition+pdf PDF link annotation
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789b7d1be8d---kuwafokari.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/donejavozinisatabijonu.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/c3d165ae2f7292924d8f89c7df19c54b/losutedod.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/17248985954.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/6683403739.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/najumuwi.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/usuap81kmkosv4j8f530gq4cfn/wumulogedoriwitigif.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/namowosululeb.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/97408928391.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/bisifasojuwaze.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/taziwonelenubezujurobiw.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161199211ae70d---zumun.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/lutujefoganirizejunazaf.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/43655552412.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/u6lq1e9lo5mfjvbsplnp2g9ip6/xipuwugarodora.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d450eb117da1d5e174d68a7a00554c02/81419531054.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/69632836970.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/vevajugozegafa.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608317fdd9048---movevalikotona.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/nabixasusazabowodufoxo.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/gobajifefulivekemuriwa.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/25744819948.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/mitalugorigam.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/83021424533.pdfIn PDF document text
    • https://lapdonline.org/file/21552211581.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D0 16320 bytes
SHA-256: a61d684141661bd7e25227023c6ce57728fecc34f676d4b5e6e450b31f799185
font_01_sfnt_off0000fd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD20 10304 bytes
SHA-256: c7cc2d0787b0359bdcfb7f020eec150af38d712c5acb4439a8687310f97138f1
font_02_sfnt_off0001147a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147A 25848 bytes
SHA-256: 7eb1fb4f0361d31c6cc559efc79406dc26e6437fded0b3d09bd21092cfa1851f
font_03_sfnt_off0001566c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1566C 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_04_sfnt_off00015ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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