Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dcacd63502d2ab2…

MALICIOUS

PDF

80.1 KB Created: 2021-09-20 03:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4c233257cfc751769dd9318e2463a12b SHA-1: 55d7541b1b79a5413e62a71949228b3bde25dd7f SHA-256: 4dcacd63502d2ab2cea444552a6deebc47911b8368612a339f1374d1c36c4bd0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites that appear to be part of a link farm or hosted on compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://archism.ru/uplcv?utm_term=six+sigma+problem+solving+pdf PDF link annotation
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/rugunupare.pdfIn PDF document text
    • https://cartolmania.it/file/82690162825.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/90379918375.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613204ead9254---2374980310.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/8949304160.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/tewejifixolatoxafabudan.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/17260454055.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/bijano.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109080837017044.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/80536771000.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dde8bdf6a3---37071393806.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vosabapobagavapul.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/jigogopebefuk.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/93286302822.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614095919a4ef---gilusokarimuli.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/parebiduruluxipog.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/51592918286.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/18661249170.pdfIn PDF document text
    • http://annabarons.com/files/files/tupenowegexil.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/909178527.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b4f8c5ec7---bafibufe.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/1865128582.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/jnq006l14f7s51umcdncc87bvd/39187184386.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_off0000d07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07E 18740 bytes
SHA-256: b30eabd727b5f19a873a3b615f96da3f60d9a5000c5ea282784972d43176d640
font_01_sfnt_off000100fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FA 11124 bytes
SHA-256: c79e4adc9feea8c440531725ef4b0364acd9bd6b7dc3d4e7ebc713216017214c
font_02_sfnt_off00011a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1