Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c9771ed9aa519a…

MALICIOUS

PDF

73.5 KB Created: 2021-08-15 13:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1de0d8089ce304fe01d1e485694a6b4a SHA-1: af5c5e5547f7e4c78b3c7f2377ce605972e69728 SHA-256: 67c9771ed9aa519ab62cc4873506d42f55db0f4a1c98e6845e8f1b10428cfeb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous links, many of which point to compromised WordPress sites, suggesting a link farm or redirection mechanism. The presence of these links indicates an attempt to lure users to external, potentially malicious content, likely as part of a phishing or malware distribution scheme.

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 http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b65440394---59867091220.pdf In PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/wedususiwapowubevo.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0afe54242---fapujumirevedebani.pdfIn PDF document text
    • https://polytex.de/sites/default/files/jalitavumame.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/fejipolefudumak.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/4fbabcfaf66fac7e8b6e3d69a6865fb4/buduz.pdfIn PDF document text
    • http://aplus.to/userfiles/file/26092799923.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609daa47b71d1---razosovolejakevebikujuge.pdfIn PDF document text
    • http://demkapi.com/resimler/files/42664044965.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/zezulajadofamasa.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac738aa4858---34484289624.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/pifapux.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/xotibamewewiju.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/0jo0nv4np30q1aihc2gmpmr8l4/pimozupa.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/xulogutivo.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8040ade901---63001282514.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2221bfae4---fukajuvetutol.pdfIn PDF document text
    • http://kotolantopeni.cz/file/pobubexaxejepajomarifofu.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/klcovr4ds78jn6dhiitp7n99ak/7807689501.pdfIn PDF document text
    • http://qqsbg.net/uploads/file/62211004506.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160764513956a0---xudavibidugemunovevi.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/zumowozuda.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608863c89cbef---xanoxumojid.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/bigiviworuxuvufomabub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=metodolog%C3%ADa+para+las+pruebas+de+hip%C3%B3tesis+para+dos+muestras+pdfPDF 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_off0000b9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20C 16156 bytes
SHA-256: b86f6d9b3a40353df2ea9b8ea4325b3b34049382d8df5a7fa8e9746858916f10
font_02_sfnt_off0000fb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1D 11272 bytes
SHA-256: 87cf9f9da3f3e35e074c4750bb2a47e40dd18572b1891ced6d043f9ab205ecab

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