Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef72e209b6a101f…

MALICIOUS

PDF

71.9 KB Created: 2021-09-01 11:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 08637f3a4f8c77abe1a3fcca09de5927 SHA-1: a4abc2b03bd3d7edd5cf2fa29456cb49e5a25f23 SHA-256: 6ef72e209b6a101fbc6c2dd43ee406a99176578aa2caeb006d0c1121b0fe0ad8
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 https://medvor.ru/uplcv?utm_term=what%27s+the+oldest+living+thing+in+the+world PDF link annotation
    • http://meruzhankhachatryan.com/app/webroot/files/file/kanisosuxafo.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/8bf5c24058e5eef9a4da6a145d25d5bf/65845584995.pdfIn PDF document text
    • https://dptech.vn/uploads/files/vidozojunodi.pdfIn PDF document text
    • http://roocenter.ru/upload/file/81978447878.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/pamulited.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081de2174425---3383797931.pdfIn PDF document text
    • http://dgjst.com/upfile/file/96665534813.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ca91a2517---zewefuwinasamef.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/niwiloramelekemeros.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/413f89a021dfe7939fd4f2db92ce2e74/1552887730.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0df2d1a64b---milimi.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/k3eha2td1jp5hfqmfd9so3ku45/darasepigadukuzofawafa.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee8e17bd40---tomopuburuguwusujoba.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/zelubuxomo.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/42424598531.pdfIn PDF document text
    • http://funperm.ru/content/file/95174350126.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b568a1ee81---ralemofawen.pdfIn PDF document text
    • http://vanhacollection.com/images/files/roxodef.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2c33846de98a55a4f295f9cb37848800/28214164783.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/fajigabavep.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/ketijusadopuwomi.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9c182e524---kuwogokimofenolotukalix.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/86004152921.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/99920826451.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_off0000bc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC92 10708 bytes
SHA-256: 18d81c44f0ff291ece4417012313b435bfbe6b2e47093700f1511d7b4cb9f693
font_01_sfnt_off0000d4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F8 14468 bytes
SHA-256: 8e604cfab379aeb5fbb8935e576d719d7759bff260fa98dd1d01a98d390dbd88
font_02_sfnt_off0000f905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF905 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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