Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9fde93577ee49e…

MALICIOUS

PDF

73.0 KB Created: 2021-09-07 20:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a7530869bd338ea841933e4f077d4534 SHA-1: 968f9ebf6db028cc2c374107f04ff9936e7c7e1c SHA-256: da9fde93577ee49efb4e1315ddfae08cf99d2c52c25196f90f5a673f73f7c03a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms on disposable hosting reinforces the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://wastran.ru/uplcv?utm_term=nj+transit+route+139+bus+schedule+pdf PDF link annotation
    • https://laps.pl/userfiles/file/vufaribivozabadadamig.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/14853378913.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099943ec9015---jenimetawarunixile.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/22226924059.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/8roepc55gscub07a3dra23vp14/fizelegazi.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/vapak.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/bibitowazaj.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/gujaxegataruditiwogunow.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/lojev.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/sixobomaneregalobopedagi.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdb1506593---noderifofesuxedogepijadix.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/4489dcbf2a5288dcedda5024b4655c7b/legoredumifujulij.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b917a6c73---73607430582.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/118f2a5949ac7b104bfbde37008f9760/lefironixudalerumu.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/ufkb84frs81deptud6h3pheke3/jekepejitugewa.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210708034545.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a84a060d16e---47878638084.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/tu69dgmuo14hp5te2ha1rdhj0i/84117635182.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/xuxowupikuvabi.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-8-11/20210811171326419820.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/7tc0kbclu07lri8hgr4dc4dai2/13515944069.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/nuvataronixomojusonarat.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_off0000b73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73C 11456 bytes
SHA-256: 576c53a27c29aeeb8b9c5770a529fd866200b285eefa3822b930932f7f2351d7
font_01_sfnt_off0000d210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD210 17016 bytes
SHA-256: 8c989bccf839774e923fbe85dc3bf33a4591fd57fe79e3fe24457965ecb83f9f
font_02_sfnt_off0000fe01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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