Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a13c61023ff041…

MALICIOUS

PDF

82.9 KB Created: 2021-08-17 15:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: dd16ed0206130618c6003b87ad792b93 SHA-1: d8a2e5728908b05127ea44ec8f7d949a05fa0043 SHA-256: 20a13c61023ff04139db48d527f16ac9268b238c128be64181bebc6c5c310615
156 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on disposable domains, a common technique for distributing phishing content or malware. Heuristics indicate the PDF is a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/1943464c8a08f288dd740eb5ada21d3a/bugirefadijim.pdf In PDF document text
    • http://okwecare.com/usr/userfiles/files/96419308091.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/45212560398.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/bipuzepomigate.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e49c1c171f---20009902008.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160abf74f72093---52753785981.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160734f20b7e62---wazakenekomurila.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/mifejidadeweme.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/bfn12tku845s106upg7u1tef8e/38252458879.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/77097539500.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/15021768727.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609119fb275b4---9467347322.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/plc9n4ud8dbi2ftrpfgbollgbh/vedaxilunaguwaluw.pdfIn PDF document text
    • http://www.proyecpapel.es/ckfinder/userfiles/files/kuluzibivev.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/wozuga.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/60786964596.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3323b0b902---rizefudikilixutulivuzuw.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/28613216659.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/0ceb5707cdf9031ad0119f759d1d5195/belolevekudu.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/lt2f35e0ckpouecf77ojklsbf4/62269746489.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/89f8474d22c28c274d9917877297e5fd/87692707824.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/gamuli.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/68dbcca4a0758743094177a8faec277f/45065332338.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/zegonawalovepenomunonasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+snow+bunny+slang+forPDF 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_off0000e076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE076 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF888 16808 bytes
SHA-256: 99f1c76b4f6660b0e7376a8ec682c314b081822b2a887deb6f3a308c52597467
font_02_sfnt_off00012414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12414 10796 bytes
SHA-256: 55fe03ac53fe62bccf69b4def48d89b045735eca6f966171934d5bdf29e980d8