Malicious PDF — malware analysis report

Static analysis result for SHA-256 970a818dde6277a6…

MALICIOUS

PDF

93.0 KB Created: 2021-08-25 03:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b3acce996c1fa5778a0c3dc5ce9671f2 SHA-1: c50230ab9c20442d81a4a25d030c42804e187ff2 SHA-256: 970a818dde6277a6dfd198e8137fb47587d22f926d944d86402c6c5dfd24b657
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or redirect users to phishing sites. While no scripts were directly extracted, the presence of numerous embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/09fa71f41520ce707af41a546fc943be/juwupixepafezasaxum.pdf In PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/8702037585a70f6c594beeb261123f72/95135622372.pdfIn PDF document text
    • http://krzeptowski.pl/file/78133440845.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/56005022019.pdfIn PDF document text
    • http://www.pvvc.cz/files/masisobevoxalenuf.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a0803fa347a---fowasatira.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/wakumosuvowovejepone.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/50732243711.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89614664084.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/kalepone.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/12805284803.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/48060183321.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609474071bf01---julirudasotelakobeza.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/jumusas.pdfIn PDF document text
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/72662672640.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/mebizitaxo.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/25153e521050f526bf4cb88b9ce45130/ligulakimadovuroruvoju.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/gsfmi6acfvc7hi3hrp01d5jd8a/najora.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ac486743317---giximufupivurez.pdfIn PDF document text
    • https://summit-christian-academy.org/scauserfiles/files/49127664303.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/lphgu6k4ja8hpcuv7qkqsccnn3/zimerivuwibudumekaw.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/vadizemarajowevuzoneg.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/fosefewojatoxoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=chemistry+class+12+chapter+1+questions+and+answersPDF 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_off000104ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104ED 11428 bytes
SHA-256: e7711715d06fa0ac64c9ad15fbff9ca2eefd68a5d9172fd2b1e282b042392318
font_01_sfnt_off00011faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAF 17376 bytes
SHA-256: a6999ca048b544bc734cc47f2b851f752ae16d2400abf14d703180cf7af8ec1d
font_02_sfnt_off00014d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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