Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a358079e7e679db…

MALICIOUS

PDF

72.8 KB Created: 2021-09-01 11:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9d614ac5f307db0b4f8aa3c4e9912764 SHA-1: 75827bf0d0de729c210b9689552314ad253653c8 SHA-256: 8a358079e7e679dbca09d5a6ab51618a37c90530f085561b0e04879f49c63e0e
184 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage, indicating it's designed to exploit vulnerabilities or trick users. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's intent is to prompt the user to call a phone number, likely for a scam. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d3e719c8ba437551a9b1e21844e5d40c/18112060863.pdf In PDF document text
    • http://punaide.com/userfiles/files/zudafoxijorotises.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/pilagobixezajes.pdfIn PDF document text
    • http://wawa757.com/uploads/files/voxivunibumimij.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/parogipilafuje.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c430cf7fd98---73529228426.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8601445aca9784f023f34f122f328b08/53496472823.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/df197e516e050cd0c15f370bf0b61ceb/18816795769.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/figudobokazokadodinonesaw.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/24746903917.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/jafawisupu.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/sulelesifipadavudud.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611aa9fa4ee32---rodituvoso.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/72169928268.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/12595390508.pdfIn PDF document text
    • http://rajeshjshahani.com/clients/d/de/defaee86e9f1fedea086b53a5072ac2c/File/fefux.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/61164992549.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/kolesonujo.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160743c27b78c2---vavejufoxo.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bc1574112---dimifipofalegu.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119b8ab7e471---gozemebogoxasubiguworopol.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/85685215882.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/55504113553.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/e93dc29b0f24b9bc978efb0ce657eed0/76023034856.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078897085329---xuresexirewalivojafa.pdfIn PDF document text
    • http://parilka.by/var/upload/file/99640462536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=direct+linear+proportionPDF 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_off0000bf03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD715 15232 bytes
SHA-256: 120fa692e649f7a72dc0dc28f4ab1c43be8a73300be5bcf41133c6a471aff92c
font_02_sfnt_off0000fdf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF2 10200 bytes
SHA-256: e5f13358b4896d31332bd527f054306bc8385ba075b13a640cd2e5f84b0f5533

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