Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9bad623c5cf99c2…

MALICIOUS

PDF

78.1 KB Created: 2021-09-12 21:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 492bcf93e91cc37f58245615b3fc535c SHA-1: 530a077f878c4454f56372fb207f23fa2e99dfb9 SHA-256: f9bad623c5cf99c2fb3cbe6f32f159973bc5fe27216b64e6f3a8f4d529773401
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://newegys.egyseg.eu/ckfinder/userfiles/files/tusameruwe.pdf In PDF document text
    • http://drtamerturan.com/file/97078088370.pdfIn PDF document text
    • http://nincity.de/inline/file/bugujositaroroz.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/zokiju.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/9fec04c2009258afad9e3cedcc58c55f/39770865074.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/83279808811.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/faxajaxewo.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/mulorudaxugupuxiguv.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305efb646d8---fimagolevegedafowaparuru.pdfIn PDF document text
    • https://phunhai.net/upload/files/xeroruvopibiwapikiwonawe.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/gegedopirilu.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f50b357643---zixadi.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/rakojudulajunuw.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/zekenulopono.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/lilewow.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/26153416719.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9ab6c72eca29abf3b37fe14cf9f04905/nurozinudijox.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/megipixubepofizus.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/6137d09ce5553.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/xiravawo.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/botofaxoji.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/vutemuvonikubupotowijevu.pdfIn PDF document text
    • https://kiptep.ru/file/22760339443.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/zexokegirutakejezemiw.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/69000226363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=harry+potter+in+english+book+pdfPDF 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_off0000cc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE488 11116 bytes
SHA-256: a94f0941af359b4fcafe4609db7680edb3419de70f420df26d24e7132cbb8f26
font_02_sfnt_off0000fde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE5 17432 bytes
SHA-256: 1d494c5b5f1d0dfc8b02e2e4c46dd289361237ececc00cf542b1555a6377640f

Open this report in the interactive analyzer, or submit your own file for analysis.