Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1c0b0b405f0016…

MALICIOUS

PDF

71.6 KB Created: 2021-06-29 18:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 97d6577974a529bf42eb5324d8d51fbf SHA-1: 728cf61bb89d25bbbeec789c7c32b63f55032759 SHA-256: 3a1c0b0b405f001667634902202f4a4c79661fb205afb24ef2bbee6d8b980ba5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the presence of external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://irlanc.ru/uplcv?utm_term=diabetes+and+palpitations PDF link annotation
    • http://winkeleninzundert.nl/uploadimages/files/regojetun.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8daf3845d8a40e1fb3b79a63bcea5d46/61914125808.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/kaxod.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dd4a00ab4---fibirabuxuwutorija.pdfIn PDF document text
    • http://m2m2design.com/userfiles/58121233248.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/8327e8af5812c18c83a90c8171d1f588/nafor.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/b7f643dae86a58698e0336192ba199e9/xuzukanevuvurulituzokim.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/vimoxiwetitederodozaren.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847646da2fa---42141946951.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/zikepaxum.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/92987c5f1ebb5c4eda57202ddaa59016/nofuwedo.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/896ff0108ff3bf903af25aea6cd77c39/delezikafivovezaduju.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/673beaefe6869ef2d128760b06a746d9/23268981271.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875b9fbd862---matumasudaru.pdfIn PDF document text
    • http://dietmoitangoc68.com/upload/files/matedavadejimodibu.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/50379a02242bbfb62dd290ae301a71c4/76049614003.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/roxuz.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b62e70bca---katutunokadukuzil.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/rojaraxineti.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606efd9bccf8a---88089530682.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/wujubab.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0aa7e6fda---tesupelolosi.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d7a1c5db7---36110071778.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_off0000b82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB82A 15604 bytes
SHA-256: 82c8002d75bf90aedbcf29e5f174ad9316ef22292f494e6c3a8c9e7eb293b6ac
font_01_sfnt_off0000e028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE028 10428 bytes
SHA-256: 19fe03c564ccd0d4df8d73b83db8f80b6d3a6deb34344a1035364633eb90b056
font_02_sfnt_off0000f7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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