Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4d2e4bfa32993c…

MALICIOUS

PDF

84.9 KB Created: 2021-07-28 11:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 47f074571b1080fb7db722bb12886edb SHA-1: 72213cba1d4ecab9acefc65b1622878ebbc214ef SHA-256: cc4d2e4bfa32993c1b719bac409d975983d04671b0c90016f217ebb6b7c14cc6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://noithatphathuy.com/Images_upload/files/30633240791.pdf In PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/l9fatb9rak2hs9gvupmag1pn0h/69258775491.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/zijozuvalupaxani.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/63123227754.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/fuxumijasu.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ogakoq1a0pvlbp0m612juno934/kotagunadufofonogese.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff414b8f2a0---tewum.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/nu6c6i4vjeiil2ddoik75ucnh6/75417782504.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e64eaf09e---rerawojonukutovimefe.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/41977577851.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/niledirovoduxupipe.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/8c5f38532076bceb69ffa3a1e92a07c2/40831873225.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/7qc80hirkk6malavk88a2atkhk/lixejotube.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/a96c276c2b7dacf89bd0c229139537f3/21591172633.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e5d470cd5---joxadunuvi.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608359dcadeee---keguw.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/82581132972.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160f77320ebfa7---wanirabemugujefefowup.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/8326d774369154ab3359b81eadc28993/mujevupowesizelefir.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746b823f775---kepivatojoziwo.pdfIn PDF document text
    • http://thetownsendfamily.net/clients/a/ab/ab79602242cca8f930cd52af13df1d51/File/63684883781.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/8227f47fb05af945562526ba34d957f6/natipubenaxiguduroso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=worksheet+of+direct+and+indirect+speechPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210713/16261258968047.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_off0000e8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B7 16928 bytes
SHA-256: 8bf59e79b120a0227a1b8c5f472782d56dd17dbe1618b4cd2480cfcda8ee2957
font_02_sfnt_off00012c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C60 10756 bytes
SHA-256: f3ba6a7c54a07c06368f3f7e04061d0a43cee5746951e9b08c4a58e160e6b313

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