Malicious PDF — malware analysis report

Static analysis result for SHA-256 264ef7be546ffdb9…

MALICIOUS

PDF

73.3 KB Created: 2021-09-05 09:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cb9e9111415964e2bba27ad825bb2863 SHA-1: 9317b403a30c03894679958f28a1d0d8744a4dc4 SHA-256: 264ef7be546ffdb9669e9f616d939b60718b2451d51c643b1b4f233ad210de58
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to deceive users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or SEO poisoning. No scripts were extracted, but the heuristic firings and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fsoa.cn/userfiles/file/muvanibixetofolegugawex.pdf In PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/cd2401986bdcd8b186a3fef556c0e3eb/punilufiluwekomuxizivowoj.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0df63d3014820d168396de1b6c2da6d3/dimizoronokejasozatubu.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/86119998619.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607665a7611d5---60755434984.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/31454840069.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59145234354.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/q2b8f6c0aa4mtahnd8q350dacf/31381059814.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210717075048.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/11643311670.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/ferozofenuzapafudefurezow.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdeb0dd697---binisadanupufet.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/33164176909.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/49b1515d5cd6e54fbb3c3e554f69dd00/18599355576.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/lujovafikatigosigeti.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/bokiko.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1628181527_3a52dd5a79.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/92492789245.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/lafumasedu.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///ziriguv.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/vezobosoxutuletoma.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/71109961833.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/33134362445.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f43a8eafbc---51780022078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=the+18+brumaire+of+louis+bonaparte+pdfPDF 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_off0000b6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D0 11224 bytes
SHA-256: d05dfcd7090e84ad9eb3e1bd039728e9ee8ba240365a5a736d33d0bb958aa229
font_01_sfnt_off0000d0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BC 17924 bytes
SHA-256: 196a1e3313231ab980886b7dfa80dac0c9116e895454d81ba0bff6ed24b2a062
font_02_sfnt_off0000ff94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1