Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c424ff48347d288…

MALICIOUS

PDF

93.5 KB Created: 2021-08-15 16:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c90305fe468448e6360b71f445d21aa1 SHA-1: d1da19af7f0f573b6ce794ceac57fa42969181a9 SHA-256: 4c424ff48347d288efa8e993269da0a31ec53dccb25fc577c5f281e9cea65fd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://synerhu.ru/uplcv?utm_term=el+amor+en+los+tiempos+del+c%C3%B3lera+pel%C3%ADcula+completa+espanol+latino PDF link annotation
    • https://gmnavarra.es/ckeditor/files/73093276928.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16084c1aa47a1a---2490599289.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/49324058502.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/43028097563.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/44764372418.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/serewivupofepifolakog.pdfIn PDF document text
    • http://biomehl.com/images/content/files/fotinigizol.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/wewunasijuziwexitopo.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/tugejezos.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/9640fd28b91880dd02fa9ab8174aa27f/75341101035.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4758e544a---sajemumuli.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/9ifngmar5eadjl7pt1ui5k87v2/wivevirexinoziwinazaboveg.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/gukunabajeba.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/ae779c421b902f75570db124e375253b/41060818677.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607a76df98229---14965964347.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/39338109155.pdfIn PDF document text
    • https://altbuket.ru/files/lunuvujen.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/1230e90bfb47fff10db242fcc411e934/nebuv.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc29445489---95455453949.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b30eb3f3e---25011680241.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/952c1482601b0c8301da087469d712cf/90881752150.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/34283609621.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_off00010108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10108 19748 bytes
SHA-256: 56d078fca3c8c9740421268f639feb48c7c3c51ae0f4eeefd1cf56ad4297c84e
font_01_sfnt_off00013317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13317 10956 bytes
SHA-256: 293ce615bbab5e7b83db0f5a9ec04ee55039392ea0e296d80f0542621d407a81
font_02_sfnt_off00014c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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