Malicious PDF — malware analysis report

Static analysis result for SHA-256 92c867264d012ff0…

MALICIOUS

PDF

110.0 KB Created: 2021-09-06 04:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4c7bef8870262c72ec95addb583f9c54 SHA-1: bfab1005640afafc8866dfb655addda324ae508d SHA-256: 92c867264d012ff0a2794c3d667a5696f318123e6ab85e9dc87b9747daae59b8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple PDF-related heuristics further supports its nature as a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://garglob.ru/uplcv?utm_term=tesis+sobre+el+bullying+escolar+pdf PDF link annotation
    • https://davidfoleyinc.com/userfiles/file/pozofowowukivo.pdfIn PDF document text
    • http://roocenter.ru/upload/file/9634955056.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/gagixulotufabozusogudepo.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608022cea1804---rusufegotelikizopo.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/77079595507.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/42dc568699630d91193bbecc0da78cf3/lirapetivijupimokanu.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b03717ad4ce---wumiwagumojulipolosi.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210805_ADED31EBD9100741.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/defev.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/28252499459.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/safatexurulizevewu.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/a1958b9d4aa9bd1198ce7192c34f5e72/navuruxebifomuv.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b26d8fb61e4---bapemulifug.pdfIn PDF document text
    • http://dison.cn/filespath/files/20210816061618.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/ridozajojegumukapovubuseb.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2bd6552e73bd3379c9458930336a5d66/391079444.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/33rqn5aq9872rbfkq9jbh5bom2/goloxevinobeluwewa.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/dumubadevuzuxakijuzewep.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/99684821513.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/99992871594.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160884a557d10e---naginelewaburerijab.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/99733945191.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/4apbuhk1vosb9td6vfbtcl14f1/44779268793.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/viparaxuvado.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_off00014237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14237 21652 bytes
SHA-256: 7cdd616bc268d0ccfd8c22a8ee7ffb308723de21e1166a4bdb6879ea0c58d0dc
font_01_sfnt_off000178db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178DB 11012 bytes
SHA-256: df82767007043fd8e17dc902e08d236039b371fdf75f76c17f75f72b021b4adf
font_02_sfnt_off0001922c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1922C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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