Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b9b6a3c55608910…

MALICIOUS

PDF

85.8 KB Created: 2021-09-20 02:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 32db200e65f2c9d538df71026a020ac2 SHA-1: 42b68914916a292e32b29b492c1247871e8af84b SHA-256: 0b9b6a3c556089103e2954f2483906195d189aee4d449559d8fe650f5664d4a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to lead users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://shinies.ru/img/lib/file/razizatetijekezufamopore.pdf In PDF document text
    • https://foodphotoshop.com/userfiles/files/tijak.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/buzejuxabogujetatuvixexom.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/morade.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/63544878216.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/u8477imt8ge9ekt0f0o6crbka2/76195259999.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/2a992c541d44ae322fcb086d2fbe9209/rabuwafubadarorozozupog.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/95139099932.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/tqmiqlsun54fkfhcnb7orkhacr/fipum.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/karis.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/70153836503.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/3e3spuk17hfn44c75rosm7rn67/pitatajemiwiputu.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/68458706424.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/44164671844.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/80524721993.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/sotisu.pdfIn PDF document text
    • http://antracit.topmebli.com/content/xuploadimages/file/motakesikusegogezemeke.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/nejorisilupizuwepugoniso.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/88274105834.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-09-05/06e0422a9a505e1ab05b87119dadc35b.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ae7a7f8be---45582588138.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/jukigifuzoragitinuzak.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/xavuvatexisenavosakeged.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/30237979950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=control+xiaomi+mi+box+with+phonePDF 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_off0000e839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE839 18532 bytes
SHA-256: f452aa38ddfdb33e9196049bea178e9134179b639a16dbd8e8c7e0e7a3f9097d
font_01_sfnt_off000118ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AD 10708 bytes
SHA-256: c988206ba8062323cac86a2c5ae42dcb7fe8b69e17f43b47ecf53721b2d15a1a
font_02_sfnt_off000130ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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