Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d73da4cf67edb97…

MALICIOUS

PDF

84.7 KB Created: 2021-08-16 13:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 55ea2286f296316824e43c97595477e1 SHA-1: fdd9a7cf9d7d4cb366b3117ea719687b06adf5af SHA-256: 3d73da4cf67edb976ad85566a409a7ffd161be17e8b3dfc1d9753edf5aae036e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains, likely to distribute phishing content or manipulate search engine results. The embedded URLs, such as 'https://coretry.ru/uplcv?utm_term=how+to+reset+oral+b+smart+guide', suggest a lure related to password resets or account recovery, a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://coretry.ru/uplcv?utm_term=how+to+reset+oral+b+smart+guide PDF link annotation
    • https://binarbaid.com/public_html/userfiles/file/46740270342.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/91100597728.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ac924c529---mafajezogozumitedim.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ced02e1e6a4---26145956081.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/51607387979.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/pirasej.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/77069757193.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/2187301618.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4c20b9c57---86918634686.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/7ea8f95adfa3d401088ad35a2f145d20/zuneduwabozufi.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/shfkagljmh0d52o937fj0v7r7h/fawixemafi.pdfIn PDF document text
    • http://huiking.cn/uploads/file/271347585927.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd6a78d849---daxabulewuk.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/gebegije.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/denibonadovuxigadafedig.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/74118608375.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073c87a99872---97808127999.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bb0b6f68dc4---13832844645.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/14712095896.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/16361897788.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/fimubepupavapabugusakut.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75dcc94230---88067747701.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/694f749d7d569bf7a350d93a0e05999c/21554611776.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfd72e13e3---wuzelazuduleduzefubofuju.pdfIn PDF document text
    • https://arabacioyunlar.com/calisma2/files/uploads/42530773707.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/fiwotebuvegelar.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098ccd1ca43e---sasotunudoxulofobulij.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/27634000623.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_off0000e57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD93 10804 bytes
SHA-256: 3c6212315003159219aab8b386e8fb58fa77fb50ed7db212536fba2344f5007e
font_02_sfnt_off00011650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11650 17132 bytes
SHA-256: 4dd6ca0bda719015c4beee83e463a12343f34e07cd3be3a8206f4f6c3cd61e31

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