Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c0ebbdd4fa0d33d…

MALICIOUS

PDF

69.9 KB Created: 2021-09-06 14:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 43f7b99b5d8a94ba395743a7a202748d SHA-1: 6d0329b98a0b709758f35b6cb79981aefbc954e9 SHA-256: 6c0ebbdd4fa0d33d01581f5dfc5ed39d346776565f5c6afb9169410b2ce396ef
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics strongly suggests the document is designed to lure users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://aslimitada.com/userfiles/file/24041516409.pdf In PDF document text
    • http://tuanlongland.com/upload/files/30286383453.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210625_5F38A28ED7BCA10F.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/42609661620.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/61885126949.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/nomivotifutanapup.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161234b0903a93---99417108442.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/tetuzifaxenafebuzageruvot.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/21116856805.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/cb3382ea09b24c502801ccca9013d50c/fesaxomuraxolufuji.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/teruzusejonowizufeto.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/55686179845.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/38570091475.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/wawap.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1b2d442bb---pitoropoguvud.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b399300eb45---69307459408.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/jejuridolitokuvilikela.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/badodefepipak.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac57b6525ed---dagado.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e19bd5c5e1f---24530599068.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/82774223369.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1606d36a304e60---27872297144.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=well+tempered+clavier+sheet+music+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_off0000b202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB202 10820 bytes
SHA-256: d37b2c022c59cfa837b905dd18d6edf4e8b7399d3ba34d680034ce657344de90
font_01_sfnt_off0000caf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30B 15324 bytes
SHA-256: 83075d9c679098fe7271a7b17084b7fdbb70978a5a3ff594ebec0a367ad6f57e

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