Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bad4c8f4c8d24ec…

MALICIOUS

PDF

63.1 KB Created: 2021-06-25 06:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 923ada84b909f6c5caf43cde0b796979 SHA-1: f286d05fa45730b54caa2b184025904b4a8316cf SHA-256: 7bad4c8f4c8d24ecd1d12679247d2a957e4770bd9193a11a06d1da325894b157
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised websites and disposable hosting, a common technique for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are designed to lure users into clicking through to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://www.rify.us/cms-uploads/files/62999794726.pdf In PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/22dvvmo32tjckj3f2c23fi09tr/24250444447.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/2b2ff786c79c2d69718ad69573c5dab4/sifivukinazisumapikuzew.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732ad849bd6---25094017608.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/519198c73f84bcff04853fee3ccbbca0/fovuziwovaboveb.pdfIn PDF document text
    • https://micro-churches.net/uploads/file/vasiwutezebefilivopesuzo.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cc54f2e8f---kewozabozaneso.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/7de21h0gb2ee5rngilu7in0sr3/dijotofazosev.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/meteburikogipuwewiwaf.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/91782846684.pdfIn PDF document text
    • http://rheumatology.instituteupload/content/file/65126043497.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/32011731728.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/2401d7c4cdf8afa9865dfc254d636295/68192021023.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/10010580397.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85ede07309---wefomalimipavixejarupef.pdfIn PDF document text
    • https://dvg.asia/ckfinder/uploadfiles/files/33682905113.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/ucjfdbdrp719h1426o5cfif3hl/lopifutuxawakufepedufagir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=linguistics+terms+and+concepts+by+geoffrey+finch+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB72C 5720 bytes
SHA-256: f01562cf12289d343926883504967254a4372ddbac742bbeff73cd91daa2c177
font_01_sfnt_off0000ca81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA81 10844 bytes
SHA-256: c3badd886a26f39eead8a28b15fa8a38af518e7a7feb97155b3a8f5d8344fdca