Malicious PDF — malware analysis report

Static analysis result for SHA-256 41dd18b7dd2d4933…

MALICIOUS

PDF

87.4 KB Created: 2021-07-18 15:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6c8a7fc27aca5e70d9b2b181c71a2781 SHA-1: abda2c7f5d9b7934dae417495f7c4a235409ede3 SHA-256: 41dd18b7dd2d4933d6de9ce6c9f6e42540e9ab96bf07449c74547f0729067662
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further malware or conducting phishing attacks. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://jancsoalapitvany.hu/ckfinder/userfiles/files/90043035872.pdf In PDF document text
    • http://zerosquareonline.com/file/saxuxas.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/55410363507.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/gafoto.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070547bc278b---wafafeba.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3355e918e50c59cd9aa08bba10850f7b/runiduwovaje.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/74086622646.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/eac5c89606538ae335e3fb631e172e8c/11144779893.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210717_F5E8AF887BE57C0A.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/wudinodemeko.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/161da20716c8d4b0f7f4c495b4aa0f57/69901881109.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/64110711137.pdfIn PDF document text
    • https://lordoptika.hu/files/files/womekevuvasilewidebijuwuj.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca4a2cf98d---fumakunu.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/1f5obhhtaqquh8gedfb61tn5u1/85024779968.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/497cdf406f6e862dd702857e20c6444c/kazofosaberazo.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e48dd6a1ac---kepubuvi.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/77748ee6bf66b1dcdc4aea2f98cd5ae3/sutavoweze.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/20785511121.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c02917f1ff9---nuzetawos.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c74b531645a---27078020024.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/mepozivimexofaxa.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/tubafogi.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/baa59def76ca83e9b22fcaf0739ee481/65082991751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=chicken+in+the+hen+house+gamePDF 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_off0000f30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 16624 bytes
SHA-256: a318a5b8398ef2548d43a4ecb294b9cd5eca75c875fe093895fb1924f85c2bc7
font_01_sfnt_off00011e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E58 10756 bytes
SHA-256: d130d4aea57e0c0a69e8ba7c401904673c65a612e13ed5bc94c0a6f1f984ecce
font_02_sfnt_off000136fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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