Malicious PDF — malware analysis report

Static analysis result for SHA-256 98faeded845fc36c…

MALICIOUS

PDF

73.5 KB Created: 2021-09-05 00:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a50cb0f55b295fa0becee392a116348b SHA-1: dd2b5105eb6ad1198f9da5a8f39e90633af3ff07 SHA-256: 98faeded845fc36cdab89b346e7a590ed33b66aa9c7075da35d44fa2b24ec9fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress installations, suggesting a link farm or phishing lure. The presence of external URIs and link farms indicates an attempt to redirect the user to potentially malicious content. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://krisoc.ru/uplcv?utm_term=adj+adv+phrase+worksheets PDF link annotation
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093013327885---wakemimokipogike.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/xivarodekugado.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/pueeqoj9rkptkbg1nc8ggn0ki2/muvovadopifuvetaxi.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/rererigiwuzoza.pdfIn PDF document text
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/92214237001.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/65938403602.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071aec1457ba---22651265650.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a9c910d79---9932943280.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850c65e894e---mekafimedulug.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607723a2089ba---fepiboxazipulop.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098be2ac9970---zasuredowaza.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/35659473092.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8637becf3---tamukurulikefabidewinub.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/78625562248.pdfIn PDF document text
    • http://dzbnf.com/upload/file///xijugaw.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/18116502118.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/398682f80de001f1aca5e12eeaaec4f1/toxiditom.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160982e8dc02a0---jiladoloxarupo.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/2c0888f6a67b5b115940cadea4dc5e3c/2286175992.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/pumol.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/53341502380.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c555bdc1f9e---wixowifuxako.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161086e12a364a---rupanunidiparuta.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceb0375fdb---54212176764.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_off0000bc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC45 10604 bytes
SHA-256: 513903166c6846dca00aba67716c85db199b4296984d18a03a3176760244d750
font_01_sfnt_off0000d4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CB 16324 bytes
SHA-256: 19e084c623c81c9161680616c1d1cecf4e3d1dd41e44276cd4b94d2929cf5bdd
font_02_sfnt_off0000fedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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