Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51e9769a582f388…

MALICIOUS

PDF

86.5 KB Created: 2021-09-02 02:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4a8aec20a1c3baac986f002b7873ab15 SHA-1: 682688cf2ea9f0461804a71cb7010358cf4f9a76 SHA-256: e51e9769a582f388dcfa9fc835dee4781b7ba78d5b212b2e50398856c389b62b
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content. The 'SE_URGENCY_LURE' heuristic indicates the document likely uses time-sensitive language to prompt user interaction. While no scripts were explicitly extracted, the ML classifier strongly flags this PDF as malicious, and the presence of embedded URIs and link farms points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pixomot.ru/uplcv?utm_term=class+3+sst+question+answer PDF link annotation
    • http://newdimension.su/userfiles/file/dazuxetogigesokebo.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/18345474710.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/pafigigugisutekov.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/72860746435.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/vunuzowalowepugo.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/kunipijab.pdfIn PDF document text
    • http://ctm.it/userfiles/file/13051814069.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d59aa018ff---xoketezowobad.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/linorireju.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/29407000231.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/35803405958.pdfIn PDF document text
    • https://gyandeepjkss.org/userfiles/file/26542799690.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/gofozijarab.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/20708751779.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/702fbb3070d6b72ae3b1bdcdf2860614/nikukowutogesanitelewajaf.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210822070115.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c11fc0d3e---miwexusokufa.pdfIn PDF document text
    • https://actorconseil.com/files/file/77738860110.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/rekokulosugamafevinudo.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160e216502d681---1282400770.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/salesapewune.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/8e03e33cb53f58879012870754fe5c0b/12050757822.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e74aab8a6---kawepebowinikutemedori.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_off0000ec92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A4 17872 bytes
SHA-256: ffa9ada062ce64f873a04fb3bd0da7d857e9836c821eb15445db0f8541a88752
font_02_sfnt_off00013355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13355 10636 bytes
SHA-256: b37e079f6b53b939726d9e53a24551825166c9804482f64f6b780f54475aabd0

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