Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c93709e91b2021…

MALICIOUS

PDF

81.6 KB Created: 2021-07-24 08:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aee9fcae1deb09e3f472d8023cba2ca4 SHA-1: d2a509d48fef7a85cb2ff7fb7074cad2c9bc78f6 SHA-256: 83c93709e91b20213e781a289c428a64412e8c84ef0497c7a5c7ad10cbee88be
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to manipulate search engine results or direct users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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 http://diversecityuk.com/userfiles/file/kakalo.pdf In PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/bolewitigutobexunujavijus.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/b46b5ae76e8a17ba9f8bf3684d88cc0d/72982526627.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/lo45iqgnbcssa1bq235mhhj70r/popojumenijuwilug.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/55949736765.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736eab19221---didujikarupagevirozedekal.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/19pni9m09hiqula38n3dtsiki1/kubatasesebodoguj.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/10685533486.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/vozebuvifasiwekifi.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/zexuzisulavokerinobur.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e583d00e41f---mipebeluvuzinuvirefiveru.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210706_134306.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/35e448b309bac509537092ea26adb836/92835157461.pdfIn PDF document text
    • http://kag.fr/userfiles/file/temako.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/20216222124425908.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/583a434a1acf0d23d037daf895599982/parijikebudogevugenenuwo.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cdbf06547a4---nisivowiwuduxa.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608036b426490---62477465465.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/notiwifipesakizegasake.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/nuxavumugujerak.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7eb454644---85041580645.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/36153073617.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=power+pressure+cooker+user+manualPDF 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_off0000dab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB5 10624 bytes
SHA-256: 6795c99dc464a156927a3eddf8daeefb0d278060bc65ab8f6bc0a401d3a6784c
font_01_sfnt_off0000f31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31B 17372 bytes
SHA-256: 564966f9568349f2191b7da3dbd7d865c04050ef3f0f6c4e83bb4fd947303658
font_02_sfnt_off00012039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12039 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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