Malicious PDF — malware analysis report

Static analysis result for SHA-256 59a4c1a774dd8f4a…

MALICIOUS

PDF

96.0 KB Created: 2021-09-10 11:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 46f6802cf00ca8e6f07ee264f5233631 SHA-1: a3a811f497827de1f85c7fe6d6b6cf5b5986dbd3 SHA-256: 59a4c1a774dd8f4a22302232b5a94ab0e1667757662e066ba8cfaef4256fda90
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to manipulate search engine rankings or distribute malicious content. The ML classifier strongly indicated maliciousness, and the structure points towards a phishing or SEO spam campaign. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/41c82e84c7dcf75168d0c4664b6fbf74/jasivezop.pdf In PDF document text
    • https://alternativecarrepair.nl/userfiles/file/domavegabige.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/fogojotoka.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/41607653090.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137ed2a4a47c---riwifujimajotede.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109071524119647.pdfIn PDF document text
    • http://packturf.fr/files/vowelox.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58965482011.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/13817807700.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/gepejakoba.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210906_124743.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/18626005134.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/dtanaqe1v2is8733nttsvo1ps7/tuvuvipimagexevasigexuji.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a067a4e7bc---59839581317.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/jugoxoxavekaramagutiga.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/rotanufixafelabu.pdfIn PDF document text
    • http://lex.tj/img/file/kimawe.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/madutagarive.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/gawexolateb.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/mebolukap.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/vipebamewosomuj.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/rorerix.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f7eb11342---43194604843.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/wokupokijomozexeza.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/wurekewam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=increase+my+instagram+followers+online+freePDF 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_off000110d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D4 18444 bytes
SHA-256: de5093b3a06a708fc360af612cdbce846f3cb11044db66e19791ab201f0917d2
font_01_sfnt_off000140dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140DD 10832 bytes
SHA-256: 86f51de7475c4be740306f177baa7ea98022c01995eb9797d3e99daf24fdd5d1
font_02_sfnt_off000159f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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