Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d56adeb40cc6fb…

MALICIOUS

PDF

84.4 KB Created: 2021-10-07 20:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ca8dcec995745b031b1f3cff5597cf73 SHA-1: 31cbde4419c724c68c08b5a6847409ad0aaa06e3 SHA-256: 90d56adeb40cc6fb5a33397531d4a504bcb76e8828147cb879e027952e8c46df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be part of a link farm. Heuristics indicate that these links are designed to lead users to potentially compromised content or phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ketchas.ru/uplcv?utm_term=air+fryer+bacon+wrapped+tater+tots PDF link annotation
    • https://navliecky.net/userfiles/file/70299328309.pdfIn PDF document text
    • https://vietcuongcorp.com/uploads/news/files/pilofalede.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151bf8f04fd0---gilepibutu.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210919_AE4AE6A2D3F92BCD.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/30183411390.pdfIn PDF document text
    • https://phnews.ro/files/file/toxozodafolo.pdfIn PDF document text
    • http://redac.ch/upload/72140630704.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/84853931640.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/kutifani.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/32275208399.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/vaviwusivewanasupopis.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/nomubitixexiditezigamawe.pdfIn PDF document text
    • https://istanajp.com/contents/files/60755715456.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/lazamotis.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/00388d5c100c88fedc3aef199ac3a1c7/gamejojazagiluwofek.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/tufivevodilokisavel.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/89051004284.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/21185081350.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/nawosiluvoruw.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ebb3643651---91228344177.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/salomexuwogupivune.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136d5c4e6f78---19078070163.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_off0000e1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F3 10888 bytes
SHA-256: 755923cd59d8ccd94efbb89cd6a69115fd0d18dd2cc915140584cfd695a6f459
font_01_sfnt_off0000fb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2C 18792 bytes
SHA-256: 14de38b1f6b0c7d219caefa79c3176143b762112645bc0e4e6512b3d1514b6fc
font_02_sfnt_off00012bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1