Malicious PDF — malware analysis report

Static analysis result for SHA-256 39de706b9e85eaa7…

MALICIOUS

PDF

85.5 KB Created: 2021-09-08 08:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 85b5fa025d4a4a17b340e5d6fd612c89 SHA-1: 14a573761d90532b47923c632f38a6a14ed8aedd SHA-256: 39de706b9e85eaa7b8c7eaedc3d8033015a86178d9c00d7a2ea2b9c48fcd9325
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/759c1f682542f0b419211492c70b26f6/zozavipujedeguzasa.pdf In PDF document text
    • http://consorzio-csa.it/userfiles/files/fikojigug.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/55015214021.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/498fd3158ac2924b9fd9acb0880ef643/nojepiwuxisori.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f0d2f8a7291---12243154881.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/lutipen.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4cfd7c1f5---7798548810.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/xabimuditunisosefumufew.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/af5ddc63db31d2e74ca5ebd35d423648/jowisafagow.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/66848831493.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/86ff508f03973f837c3496a204935b18/48745622991.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/50108581190.pdfIn PDF document text
    • http://nhatnguyen.vn/media/ftp/file/26698284851.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a369a5baf23---32521865427.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/82396068121.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/60569502052.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/t4e9r6ub78548159hqpdsgjfnd/63326426203.pdfIn PDF document text
    • https://kede.org/userfiles/file/60991406825.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/pixede.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/zibevekevaxefiz.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/donafogogutovimefono.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/96181587983.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/8fb979bc933deb53dd7a9ec84caa9c9a/76573624123.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/3186069927.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/zumumaxamalepadomegegi.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/xereperejukupujolidudaruv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=plus+que+parfait+passe+compose+imparfait+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_off0000e14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF963 10924 bytes
SHA-256: bba086fc64e24c9ea4a46b9b35e2e57d78f8525ef5d7dc89f050340fbacf7944
font_02_sfnt_off0001128a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128A 21188 bytes
SHA-256: 5c316c57c88c75239f0b63567093cf4fb52de99c445ee07a1cb89d297a04faeb

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