Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f03dc38547b4c2…

MALICIOUS

PDF

73.4 KB Created: 2021-09-18 20:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e23c08f7f805f9ee5829aabfad075ca0 SHA-1: 8cbd6807bff5663bfc3614d0a70aefa2ca670361 SHA-256: 20f03dc38547b4c2e8837641002a08e1070b6dda8a7b65082d6fb3c99dbdd99e
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing. While no scripts were explicitly extracted, the presence of embedded URLs pointing to potentially compromised sites and the ML classifier's high confidence suggest malicious intent, likely involving the exploitation of PDF vulnerabilities to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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.
  • 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://mytopics.it/uploads/file/bonakaxikonox.pdf In PDF document text
    • https://alnahamgroup.com/userfiles/file/88661373566.pdfIn PDF document text
    • http://kahasat.cz/data/file/46296963114.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/btehjf8l5q0pneiao5b1empo67/rizuguzopuf.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/zorinirebivis.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/47907621493.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/bajujeni.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/97024094180.pdfIn PDF document text
    • http://maksimetall.ru/files/vikojidajoxiwe.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/ruwozarobaritilazogima.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614203759f3fe---bikokesoparonolazek.pdfIn PDF document text
    • http://elementyzlaczne.pl/media/file/lesasakawe.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/a4250d2976be20a7fde4b194b25250f3/79456453053.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/puses.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/50824467050.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/debowedajejuzuwunibu.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/gezirelizedeza.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/talotezopijojizalir.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/91886362132.pdfIn PDF document text
    • https://fuoriscena.eu/file/xesizelebozogixe.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/zovenamibidomerijigiw.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/xipod.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/nafimoda.pdfIn PDF document text
    • https://bnovum.hu/downloads/rewobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=wade+organic+chemistry+9th+edition+pdf+downloadPDF 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_off0000b83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB83A 11428 bytes
SHA-256: 37e16fbf88f8bc41148f6e65627a7af7179e910f6e006a40db79c38adf11c8b1
font_01_sfnt_off0000d2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D8 17304 bytes
SHA-256: efe244fc8e65e40ba3e2c45fbd82d0d50abe2c1514c3bf8d4746686a525271bf
font_02_sfnt_off0000ff8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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