Malicious PDF — malware analysis report

Static analysis result for SHA-256 45f51de12bcb889c…

MALICIOUS

PDF

84.7 KB Created: 2021-09-04 06:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3e5f3f447174e3ab533c0052d52972b1 SHA-1: 3d162da6a896b631790decff0f82c7c64164bc88 SHA-256: 45f51de12bcb889cb330ff99baf9d2fe65d27feb14658f46b39e2349b009fed8
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The document body was unreadable, but the presence of numerous URLs and the heuristic findings strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://eminenceinc.com/userfiles/file/suzemasavutijid.pdf In PDF document text
    • http://www.ecostroyservis.ru/File/32176921148.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab01b5d84f4---sefokumamijedudopil.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/35i27e4lan207d3uovjo11dr1l/91523999326.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/xebojen.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/dipagowoz.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/78287386521.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/literekoxoronifamef.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/xusexate.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/miditewomatavufevozovi.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1612670d66921f---6485175407.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125134fdf7a3---lobuzofigadonab.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/bawumagemukukesekopalana.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/kinemovoz.pdfIn PDF document text
    • https://campermagazine.tv/public/file/debixuzumoj.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607881187e94d---desorosebuwadefetaxagewu.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/65460182489.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161257cfde5a25---28174974805.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/rogir.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/a587d5a349969a6cc92ab557055b536b/welujetuw.pdfIn PDF document text
    • https://majubesar.info/contents//files/46289577621.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/nefaxufepubukifajas.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de2659df9e7---14506087681.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/7d78426fc55e39ecd90ed49ba400211c/kesabovuvikuvapoku.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/50774788031.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/nozigufemog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=como+fazer+capinadeira+manualPDF 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_off0000e12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12B 19744 bytes
SHA-256: e8f6a42f883fe32869d9be75827719362449949407079896567314f921d0a785
font_01_sfnt_off000112bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD3 10704 bytes
SHA-256: 6278b6cf22cce836c8bc6f8e35d0d48db22e455f495a5b32c5de8712ce541c32

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