Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0a22ee23fa2e54…

MALICIOUS

PDF

73.2 KB Created: 2021-06-21 05:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5b57e071025c3a469ad00caf07a78a0d SHA-1: 39d497d207995bae4671707ed653ca79b63f4ec4 SHA-256: bc0a22ee23fa2e544b09713cbca424f67882b19b45ea5a6205aad204df5d1572
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF document that contains numerous links to external websites, many of which are hosted on compromised WordPress sites. The document body, though heavily obfuscated, suggests a lure related to 'Galaxy s10 official wallpaper'. The presence of external URI heuristics and the ML classifier's high confidence score indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://medvor.ru/uplcv?utm_term=galaxy+s10+official+wallpaper PDF link annotation
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/9d70f5ef7336dc2ebf4beb95118e6fbb/24371599851.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/ruwozixizonev.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/jikorefutuneteno.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/funujepifetidovexuj.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/22c90542d68ead1cff17ed5cfebf9a43/xuxoxuzelumetisoferipev.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/padixikada.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/d5b08ae8236628ee9370d052eaa70934/zojudutopabupobadunow.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608208f367dde---momozikugagezup.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4c67b2fd6---gujupixogopukupijuredopuv.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/48748291149.pdfIn PDF document text
    • http://wawa757.com/uploads/files/bibapajapofekoz.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/wijotitefufofegazijud.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/3409fcdc4648f44aecb18ae1d39a8521/jenana.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e917c6d15a---sotogikilapopuvul.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/vodakufawe.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/4de49757430bce1af78c7fdf0f3efc5d/93714249093.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/evppmh787gmkfeldopgj2m1hek/xoboronusuwi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD3 5496 bytes
SHA-256: e6ac360739f7b154975f7c384af06998b2ac5b9d00a63d885cac99a863c3b9c6
font_01_sfnt_off0000efbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBD 12020 bytes
SHA-256: 100760bc5341da1fd674052555b071ed86cc9f7f01c8f11e1b4473cbe3a24ba7