Malicious PDF — malware analysis report

Static analysis result for SHA-256 71fa9322e5259a5a…

MALICIOUS

PDF

85.6 KB Created: 2021-07-06 15:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 89027cec7335f54a86f8dc3085d6cb42 SHA-1: 452f2b9e923ce7a8c25ad0006725c9199218505f SHA-256: 71fa9322e5259a5ab13dfd7dd4d4ecaaff5db1b9548433a8a03f1d35413efd97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites. These links are likely intended to lure users to malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/69ifo83e19scshohg8t76c0av5/72307714576.pdf In PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cad074cabed---liwopurapapemilutonafemu.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210619200220.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/47183550371.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080f58db5e9b---7892843736.pdfIn PDF document text
    • http://fygl.net/uploads/file/311307553687.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/95360115153.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d02d17b756---31849923352.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/66148115240.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/40912679659.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/72410777160.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16091d046551ed---xisirozobenuna.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a76729166c9---mibif.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38c08ef7b4---7258612152.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/nudura.pdfIn PDF document text
    • http://danfilenemd.com/clients/67744/File/kilelinulisabanazaso.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083911749faf---raxezofomomuzigesoda.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160879406a78f9---60606902798.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/kowoxobitevekogiximo.pdfIn PDF document text
    • http://slsnn.ru/content/file/jesuwigubalovog.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608610a7578e1---68031577469.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/80660180992.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839184d1bfa---71496452048.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa831eed59d---jofogamikiletoxuzugim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=wasp+bite+on+footPDF 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://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_off0000ef6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6D 10336 bytes
SHA-256: 66c8edc5d19c3462a14067020223825d0b85e43d0aff8ec2b32e9c3c62db0912
font_01_sfnt_off000106b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC8 16392 bytes
SHA-256: 2355eb665a2f3789d009b7aaa92b5b9c4e1a40e3d63ae0c0055197434c864d10

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