Malicious PDF — malware analysis report

Static analysis result for SHA-256 3036af2134abbe88…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 05:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 88e6a8da0fa23bca0e3f49f46988fded SHA-1: 26ba9a7365a33e4297515de81ac7561964383adc SHA-256: 3036af2134abbe8806a7ce05ffc9dcaa669015bd43152726e3ea5ea4eb8746f9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of many external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 https://crysiq.ru/uplcv?utm_term=what+is+the+highest+graduation+honor PDF link annotation
    • http://hainfelderteich.at/69786962446.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/6ot556c85h8fam64man6qmd69c/94098104001.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/gazizixodexetikujeduz.pdfIn PDF document text
    • https://arendic.cl/files/zozal.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94e460d7e8---1626135105.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/97414996249.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085592fe5e69---paliwokoli.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210601_0D575AF6C427A803.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/fukovufopadax.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/ui8cf3f2trgn7pqgkfvha29dt9/renovavawuguzosukote.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609475cad03b9---66415887026.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/fekokekizo.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607807285244b---59057582697.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/75906031354.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/63187226385.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8e08b204747e721748e849a55baf783c/54677521654.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/20424871121.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/pakon.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161076f68c82c3---nijezovolopolipanij.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4997106347.pdfIn PDF document text
    • http://tafoto.de/img/upload/files/pupalejikimifike.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/32620787507.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/63c7da164551e285772fc80057a04172/dugoj.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d55e1d6774---66066315728.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/fegoxi.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_off0000dec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC8 10572 bytes
SHA-256: cbe673f22dbebd4c6bb2c876bd6c9cb2289199ff2a03b2d4382e7cdcaa72ff5c
font_01_sfnt_off0000f6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B1 18724 bytes
SHA-256: c4be6cb8aba558b75edceb1ccb91bf34e795b1e9c7bd2c7b40b059fa7253b914
font_02_sfnt_off00012770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12770 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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