Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aac6c98b7f461e8…

MALICIOUS

PDF

79.4 KB Created: 2021-09-01 04:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ae7a27cef1d2762328fa61723003c274 SHA-1: 81825cac844e7dff065a0ed47300825a44aff83c SHA-256: 0aac6c98b7f461e8cf7574e59e27059b4c2497279c322ae00c8cceb574010bfb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ketchas.ru/uplcv?utm_term=gotta+get+up+gotta+get+out+before+the+morning+comes PDF link annotation
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/1401a0a70c599a560f8b4bc004558002/dodikovibusufipudedubip.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/76bc63c062ab689d4a3bd212d62e521e/gofililewijemevejaterifam.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/vulijotogiz.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/52706672542.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856747abe47---nazatedigi.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/8207812450.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/kivez.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/jabetubiser.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/53779142265.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612413d734f59---37414991799.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/lipabejobekobato.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1625802546.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2b6a63174479c38326dfaecd22c14a9d/monolerogaxixatudezug.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/31712775037.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/9836130416.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75708324720.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610e100b99fe4---fitesawaguxonar.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/lodewuxutagemalajexiwa.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/jajewijo.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/4ab1521f9fd910492cec68822e04de08/20778518060.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/nujotumizataxurizufi.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/6ev7jud6evme4su7p57s9o9nr2/gojopotazatim.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_off0000d04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE861 11160 bytes
SHA-256: 3591d7823725ebd9fd6b838c22694fd36ed8d6e48f7f1d740b09089ae29b6902
font_02_sfnt_off0001021d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021D 17552 bytes
SHA-256: 634957a7f8fa40801a23ecc128dc375fe9fada6c5ce146a76d81f4ffa45c703c

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