Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af97dc15114ce58…

MALICIOUS

PDF

90.7 KB Created: 2021-07-10 13:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: aff8adf7cb5e77923e499c5545384470 SHA-1: 9d9ed79bbb54ada0496181c8cedc4b0b6c98a844 SHA-256: 5af97dc15114ce587691880c755f31b59e88e76bd3734daed0c20e9c70be4209
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be link farms or compromised CMS uploads, suggesting a phishing or malware distribution scheme. The PDF structure itself is indicative of a link farm, designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://queure.ru/uplcv?utm_term=plenary+inspiration+of+the+bible PDF link annotation
    • http://bjjiffy.com/upload/mogepapibawoluluvamo.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef70c231a2---94417100368.pdfIn PDF document text
    • http://abnicum.com/files/file/sudatowovov.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/9f569286de6f0ad9ac60d3211d59a024/xivod.pdfIn PDF document text
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/40387937586.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/filepor.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/nonoboluwavasobuwova.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/gekolitefirajowat.pdfIn PDF document text
    • http://araonline.hu/uploads/file/vuxukopafozed.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723f47df2e0---dijivijojetisimamusewepa.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/mulemi.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/nekesede.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/tusatcnol97q21i6shjfc6vfa0/76982204173.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-1/20210601104350860375.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/7ef227ecb7e078e2bdf2d5101967b92e/ribafugotikopepaviva.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e90ef7574a9---vamapasikuwetim.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd27003cc8---14547480727.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607de0f1d3419---dowadafa.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe7b8f3fd1---85699862576.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/f0401c53ebfc71e03417b572df263ed7/xizokokilezajovomuzet.pdfIn PDF document text
    • http://ladue62.com/clients/2/2d/2d0487a90c18d3a1b3df44839405a665/File/59669816258.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/bisidodimisopijom.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/10970902237.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/k77neclkqi8c3c633jc9o9t9eh/lozetuziforekopibisudotod.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c35ea3bb42---50915251747.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_off00010058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10058 17100 bytes
SHA-256: 2292541b5d1676bc2a95e879c7e460ddce7dc1dcab5cc04bf3de22bb401bfe34
font_01_sfnt_off00012d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D07 10708 bytes
SHA-256: 372c7254291f6c18f3cfe9d62c0052557bc6baa8de1b485a715d6938b3b63310
font_02_sfnt_off0001455b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1455B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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