Malicious PDF — malware analysis report

Static analysis result for SHA-256 49ace6c284cb8bc3…

MALICIOUS

PDF

109.8 KB Created: 2021-06-20 06:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a0c233360e6e2d7cfdc1d205cc4aaf94 SHA-1: ff123432b9fb024ee07f044e478fad1566e751b1 SHA-256: 49ace6c284cb8bc36b825869e3eca9321d593ec03891a01db3e15068f7fe6cbc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file exhibits characteristics of a phishing campaign, leveraging a link farm hosted on compromised WordPress sites and disposable domains to direct users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to lead users to a second-stage payload, likely another malicious document or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://protradingindia.net/userfiles/file/ledajuduzamosuxaxuxaxewar.pdf In PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608576f05e1d0---feregitamugelusujakipalej.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/91633172425.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cb453809f7e---42657432280.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b456250b48d---wofutimemorimigibogarodi.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a1430ee0b04---81838810782.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/lititimadiviriz.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/52503ffbe1c295fa672066e93fe507c8/92068207826.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/vaftri92bdq16pkef8fjonv7u5/94607701423.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/74f3b076c141de8bd50a6a0436b6c8dd/jarokoturelu.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/6efdb2c6ee6f3d01a102ee915f5f86e6/88033251130.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d6a402991---3869314559.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/tokorekovaloges.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=kinemaster+visualizer+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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000134f2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x134F2 29032 bytes
SHA-256: eaff36661c5f43b085804abf8f4fef21ee92028a45e6d67c353bea4a991fb88a
font_00_sfnt_off00012378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12378 5140 bytes
SHA-256: 703dcc13520ac6fb148a1de79f656ef0ab2fc8a8001469a9a352b4536bf5c5cc
font_02_sfnt_off00016f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F2D 10496 bytes
SHA-256: 315d707b7b0a25b31091decc0810d8d5b1152d7d61ee2dbb01e4287302d71bcd
font_03_sfnt_off00019328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19328 16592 bytes
SHA-256: 462a3ce3f6defeb260616875373815d70d3e809e2e84f3d6e47b4038663f5ce3

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