Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75185195c71003d…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 20:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fb59c5fbf2360961f643cda0994291e6 SHA-1: d9a123214c9c3fc5e2a1d1ce6a945ef18f9421da SHA-256: c75185195c71003d321d09a4e40f0b0078a3e5a36388309d541356c6e743059d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly support this assessment. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://superpackeg.com/userfiles/file/zakisisivujupinanupisajul.pdf In PDF document text
    • https://clubelsendero.com/img_pag/file/39885749841.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/galod.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/4617753124.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/wekesup.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136894eade57---rukazotijugosakasesaf.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/7429835028.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/maligimaxibudosaparodigij.pdfIn PDF document text
    • https://lyubomiradineva.com/files/file/95495475832.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/jogidafi.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/87059185122.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a3ce07e37---72692181564.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2b7a5c880---70742083577.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109052227242042.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/vu018h6ktbuvctechrb5imni95/mijuloxepamokagetimafisin.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210906_075904.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/82537966072.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/bazeruw.pdfIn PDF document text
    • http://abnicum.ru/files/file/liwiwuw.pdfIn PDF document text
    • http://lex.tj/img/file/beditodepol.pdfIn PDF document text
    • http://bibonatura.hu/ckfinder/userfiles/files/86848323781.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/v3qua3dj8d9d0llc6r9v1jf1ob/kesoxo.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210905190512_k7o784.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/81319504861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ultra+realistic+mod+apkPDF 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_off0000dbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE1 18144 bytes
SHA-256: ef76e00d8e384e883b92f46ebfe9be739a3bd3fa654d627e232fcfaff7f38179
font_01_sfnt_off00010b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B92 10672 bytes
SHA-256: 4a412eb8d32e56dae42bd76da2b47350baf565105c615039a8f3971faabc44a4
font_02_sfnt_off00012409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12409 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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