Malicious PDF — malware analysis report

Static analysis result for SHA-256 56e6fbacc1602dab…

MALICIOUS

PDF

83.1 KB Created: 2021-09-02 04:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4816fb17a617b8e120b243c32ea0c8fb SHA-1: 0964ee4b98edef931b7c4b5bbb99e4ddb67ee6a4 SHA-256: 56e6fbacc1602dab675f777b9e51cd795a31adb3c86d8a57ff70a707b78cf205
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://files.ibiza-ferien.de/file/64600094007.pdf In PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/68568504575.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/1005652659.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c9ebb493b---gumojemepipoj.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d903d5de8e0---zebomamajujor.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/22568341656.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/21ecc99e9244c1bce60e0181e926e43e/fupenuzibememipinupuku.pdfIn PDF document text
    • http://hainfelderteich.at/duragonewexuvonapoduxi.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16216281384032.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/on6kipo575plgohl61h4l60sg5/tenezepusatijugetanalira.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/bo20lraq8iibtd196b7095kka7/bobojerodaxofunakisorunid.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/ritasijisevomuberuminu.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/sakulirogoruxotokifivid.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610c6dca03682---pizoxogomuveg.pdfIn PDF document text
    • http://tyextractor.com/d/files/buwowaxopexuma.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/fifizetoxinerugajikedu.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/biwasoxegidowuwogi.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/6de6a7c0d4a3cb12e99c7a7b48214032/zedetewojupos.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/ea12dc412420810a9947e1d209cfd93f/12174115520.pdfIn PDF document text
    • https://shiokerbau1.com/contents//files/gitoxuxobadugadanenup.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/jamejukami.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/82183772850.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/5632719585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=galaxy+s10+wallpaper+punch+holePDF 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_off0000df03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF03 17736 bytes
SHA-256: 4512f0058cb69cd1ca903789fdbf08569da7646a823a2d61803dacfeac302937
font_01_sfnt_off00010d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12567 10896 bytes
SHA-256: cf8a163212969cd4bdded60dba15d7ed6d0ddc4d576faab90b197a19b7c403a9

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