Malicious PDF — malware analysis report

Static analysis result for SHA-256 a683b65b856caa1c…

MALICIOUS

PDF

77.3 KB Created: 2021-09-06 15:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 56f77036a33cf161b15c0af6aa8570db SHA-1: a6f8cbfa7841450145202396eb57273c69e02e97 SHA-256: a683b65b856caa1c80b395ab072ee6cf309327be97451cfe6c46546b4bca39f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://nomylo.ru/uplcv?utm_term=macro+nutrientes+pdf PDF link annotation
    • http://pwmtqatar.net/userfiles/file/11486345142.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/nigikibumupisexovavojo.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/22531188865.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076d81cc0619---55976128528.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b507cd67414---viliminazejurijipotoretox.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc460e8819---85190847240.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddbc4c553f---wifilasuzakow.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/bemipusirosexas.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/tenobamudebaruse.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/47462469866.pdfIn PDF document text
    • http://sapaethnic.com/webroot/img/files/mawag.pdfIn PDF document text
    • https://bloc-immo.com/images/pojuwisetirej.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/2745720240.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/71711201428.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160811404b2131---77252140674.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076c33e6d7fe---bapudaritewera.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66130930580.pdfIn PDF document text
    • https://led7.ru/file/54826639698.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/gakojurakubeso.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/73437456070.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16096c64beb951---wibogologebexuxejo.pdfIn PDF document text
    • https://tele-video.ru/upload/files/pugevanaxurowemubofe.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/mulevo.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/3ff27ccc752c14fa2bccbeeb5be19a69/70845414713.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_off0000c6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E2 10660 bytes
SHA-256: 28329413a132d1b6acacf8c0aabb35605293fae53174b0e293a0b11ad7d7f5df
font_01_sfnt_off0000df6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6E 18604 bytes
SHA-256: f3a9924bba051ca1919c0165a8748e3fdd58cbd1cec86cf59048ad77e77d8587
font_02_sfnt_off00010fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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