Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec5956ad4331ea9b…

MALICIOUS

PDF

90.9 KB Created: 2021-07-02 04:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 493e60c81b9fcc50f7ae078ccc8f55c8 SHA-1: 17ef63d26357e7ba515c2b004d208a360415f69e SHA-256: ec5956ad4331ea9b7dbb8325ec528d8b21ab135e03a18f3dcd247da9ada718b6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution campaign. The embedded links are designed to lead users to potentially harmful content, aligning with the characteristics of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crysiq.ru/uplcv?utm_term=soft+hearted+meaning PDF link annotation
    • http://all-pass.com/folder/editor/file/2387363457.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e1007bff2---gixamopireliribu.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/8657bec626bf0e2c6d322204d8819468/jogagufatelozufe.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a598a93bf3d---luxat.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/gupasawujetu.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/sdj1rjqlrh4i0f3vasvnndk9uk/80157447396.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11fee98b9f---gubizusuvafila.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/ebjnpcbqujmal5n59ia48thtea/wikuxazejitelop.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/11523239204.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/b57dd8addfaedc5a1cf1b53f91e043b4/41611444022.pdfIn PDF document text
    • http://brookhavenclassof1967.com/clients/0/0c/0ca802fc87877f8c548ddf85495caeb2/File/87583212279.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/58466183074.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/86372222960.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a8e3842a2---dilarumufadevededavevu.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/12716224127.pdfIn PDF document text
    • http://dbhsreunion.com/clients/21010/File/lewefisowagumodelureka.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/5814f53b727db4a8a1e72322b9eb4c55/tadexejetetabesupop.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/6851658172.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ee0e0992b---jitatoguzujikowigimu.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6ee631e80---xibofupetafozilelaratob.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607033970a021---40410885694.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/wijepolugutago.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076c0376a8bc---91496473356.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/37513792039.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/i0qp6eblrseotmc3b7hra3kt8e/sorupinogimazivepatapame.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_off00010229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10229 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A40 10660 bytes
SHA-256: e7fc51241db8122c761488fe926bd258fb60b67c1f8a497c5f3c106e49434c97
font_02_sfnt_off00013246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13246 16912 bytes
SHA-256: e0365b231fdb1ee2e8f310ff0da98834358cb597639b50ae1accc6f9e352b55c

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