Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2fa13babb8e0570…

MALICIOUS

PDF

78.5 KB Created: 2021-09-22 17:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 58b320872783d04d8ddcd3aa3cf526c8 SHA-1: aa4eb4fc9c6462bf92542f9c49d98d8a92d7c74b SHA-256: a2fa13babb8e057061388fdd40a05a90170de76f9821d921133a1e0f15209420
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 compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://kaithompson.com/userfiles/file/sudorekutupigebinizu.pdf In PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/73548515233.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/rugifexu.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/zuzinujijo.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/23718124215.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/54855473659.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/8b8bf85f866aeff52f86ad2bb6122802/vagevoruwawanulano.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161430f79128b5---divusa.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/fodozuvivoz.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/rogosibakuno.pdfIn PDF document text
    • http://fitviewer.biz/files/file/pasaletewiwim.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/30570278618.pdfIn PDF document text
    • http://geotersrl.it/file/zodabemivulifatu.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/vamedekomitudavuzonaj.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/4656377109.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/47916357100.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/7c0ee363e060c7270f775a72cb59d85e/39142512652.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/64548950691.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613655aa11c4f---minefolefojovezes.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jugimakowajipodeniti.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/wigazazezezagaguvuvixabo.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/17266704992.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/guratupawuxegenofubexo.pdfIn PDF document text
    • https://pecintajp.com/contents/files/29940907416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ap+biology+online+textbookPDF 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_off0000cbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE2 18892 bytes
SHA-256: d004845c004d41cf7fba506886ffb400de1b25e9d17b33ef0ebd4288bd900a52
font_01_sfnt_off0000fcb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB7 10424 bytes
SHA-256: a767181349f81b0d5ab05d3ddcd9fb426e993330c75aeaebfed2221641022c59
font_02_sfnt_off0001143f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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