Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b9b5f2c705f77a…

MALICIOUS

PDF

76.8 KB Created: 2021-09-18 07:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9dfbd633a8be85761d0bc685359e79d1 SHA-1: 0b3bef32235401f505bc85bff84d0d10ee7d3857 SHA-256: f8b9b5f2c705f77a6ef3e53bf0f7eff6281fb6c5921eb9a6b6144eba62045c02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution intent. The document functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to external resources, likely for malicious purposes such as credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://queure.ru/uplcv?utm_term=nba+live+2003+ps1+rom PDF link annotation
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142692b1b0eb---ruden.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/90965046052.pdfIn PDF document text
    • https://www.miotsukushi.or.jp/system/ckfinder/userfiles/files/womagi.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/88e2b7fd56943a4f30f049790d939810/93390168389.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/25010946424.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/86523986548.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/9108753487.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/22757676518.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161407eeb005e5---54257470483.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/57249159880.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/jolelev.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/gewobevitusisuz.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161371d87dbc66---lavakaji.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136895ab49a3---jokudiladotaxisojase.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/wezufu.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/87558211418.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/podarovini.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/vu9m8q5mkqo3hvcfijjit34n8f/botomotituwe.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/51895051154.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/jipul.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/28380085911.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf09278ff6---fubizu.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_off0000c4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD11 17828 bytes
SHA-256: b5f5102146480c3bb0a598994b9493b8ce4df1f0370b36e38b62f76bc4a3f1f6
font_02_sfnt_off00010c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C85 10860 bytes
SHA-256: f38a0c093f71fe3ba1453647377d1c7f752eab779b8a86ece6a536881b75d42d

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