Malicious PDF — malware analysis report

Static analysis result for SHA-256 29902dc4241da130…

MALICIOUS

PDF

94.1 KB Created: 2021-09-07 20:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ef41338d5934316bb8d5417e179adc1a SHA-1: 8bc432ec4cf8f28c120ba3837f2689a5983c79f3 SHA-256: 29902dc4241da13033c09adaac253f0c4b39f4d0238f935e4a7763f958b847da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://irlanc.ru/uplcv?utm_term=ovalocitosis+hereditaria+pdf PDF link annotation
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5cbc2af7a---kixupivus.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/dofurune.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098a398ad57b---joneluvobudinenebenutedop.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/cfccafb1ad11b13bd1dd75648b1e81c9/dowisubadufedimevomatuto.pdfIn PDF document text
    • https://salwangurugram.com/files/88683117035.pdfIn PDF document text
    • https://invest.pl/userfiles/file/rabiwelabelexusewur.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/ratovuxisonu.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/42512763771.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/jozojex.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/botogod.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31d76c9aba---60646703065.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/8db9ec5e84375dd0edcacbb226362f05/samiwinixuwobo.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/wozevuxuweguva.pdfIn PDF document text
    • https://efnnma.org/files/file/15577677499.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/f81b93dfc8c8695cc42148b3ec749c84/bifojufanuwe.pdfIn PDF document text
    • http://balone.net/_upload/file///jenedogojigopenan.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/90807839007.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ad1283be5---puzogodobuzojep.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b27468952a7---ruvixa.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b09578140---33134084945.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/77633088335.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/zefizidimuxafurovunimo.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8cd534697f---jilurifubut.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/turog.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ec989db3540---lipuwafemawobomulil.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_off00010614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10614 20076 bytes
SHA-256: 0ca0b4c4dbe8e05036510a3165efb7abe6ad93fba85c9b8ba82988db7988c6e0
font_01_sfnt_off000139d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D0 10704 bytes
SHA-256: e0260fc6a8723bf62307dc196de578c9070ece58816eba10281ef153b193d2d0
font_02_sfnt_off00015291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15291 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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