Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f62acdef51ab73…

MALICIOUS

PDF

75.9 KB Created: 2021-09-02 00:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 24ef86754c22fd27b69c04fc9c96dc7b SHA-1: ac8c1948141b257b90fd280aa6a3a249f8635b4b SHA-256: 91f62acdef51ab73139b1990ed88886630e87a26b60af8d6f9e5244a78ccb1c8
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, indicating a pattern of SEO manipulation or payload distribution. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and URL findings suggest an intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/c56bb6ca836d4b3b65739151fdd7d8e8/xopejexulijodewe.pdf In PDF document text
    • http://jingkangchem.com/upload/files/vefevifogobimudewejaj.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/nobepuwimotulevesave.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/27025063994.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/73073405479.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/24227929774.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/dotumapijuxakoxazukiko.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/r8t2v98793s9kmvg2tp1vdcajd/jabenoxiroko.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/a00ce5717d4ab3ce2c8054ef67e04d83/56942446872.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16076fef92792a---kimewurokibimejifewuz.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612d0cea486c8---ditok.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d214e4e3594---24619611603.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/14125205946.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/3flluhsemqrqkguiqmqbdoui2h/9029226776.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c508ec147---61667601792.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/30292027823.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161217e212487f---sulovuvawekireradaz.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/49908427539.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/f104442a49a686a2735bb9282da7c2ff/xipugapimazavikeval.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27482f2d2d---16381896084.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/gotulavonomezodogotuge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=indian+visa+picture+sizePDF 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_off0000c6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F3 16444 bytes
SHA-256: de6b6a27d33fd5071ab231ec0eef799a8d64542584e40328c85d95162e892f15
font_01_sfnt_off0000f102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF102 10520 bytes
SHA-256: c2bb2adc6f4b82a703f39b6e128fd115801a5a247a55a142831143a1310aa305
font_02_sfnt_off00010927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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