Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9486cd2d70350d4…

MALICIOUS

PDF

80.2 KB Created: 2021-09-16 22:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 289cf609f75c13dc6d29424f4be3ac14 SHA-1: 2e058c8299230891a6c9f89a8ce13cf75b80e507 SHA-256: a9486cd2d70350d451aa0c8f7517f1b16e01a11343112642739995956fbf3824
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, with several heuristics indicating a link farm hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is largely unreadable binary data, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://inwebjor.ru/uplcv?utm_term=how+to+recover+clipboard+history+android PDF link annotation
    • http://itaxabc.com/userfiles/file/20210905070745_1403317433.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/danivomifuwetipigin.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/88167976026.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/33665294018.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/42654521866.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/vc43aeh2uto0jog2654da5guf3/46406995796.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/kebafivufupubuwep.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/zutuvufimipuvaxozewisow.pdfIn PDF document text
    • http://iucecb.com/files/file/30715754348.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/73860162778.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/3253831832.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/levubawilalugesawotatonis.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210907_061840.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/9166443aee5f509c9c2cac9aab15cacd/gatimegoletaduvizefifefad.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/66639145280.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614235836f43e---tesarugez.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/nr1bfspq7fbooq3a7p50kr0ahb/nisafalalabozowis.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///xaridanorakulimexelo.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130495e8511d---58704454283.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/kedizetopizaz.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/43073424394.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/skqgio1l5003beurp9dr1jr5o8/bimajeso.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_off0000d572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD572 11008 bytes
SHA-256: 78b0584782e837b823f0465185461aa23403170df462e35eed33496551f78882
font_01_sfnt_off0000eec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC1 17184 bytes
SHA-256: be99dbf057acd824af11291ad12b82ba1974564c3f8c9bb11b67fea7d9942408
font_02_sfnt_off00011b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1