Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd95cb2a4df92d0…

MALICIOUS

PDF

64.2 KB Created: 2021-06-20 07:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4d8b70dad8bb1c7aa7c4f47ca813dc29 SHA-1: 82fd3cbb5e8003ef445e0531087b9a46a0a7734d SHA-256: 9bd95cb2a4df92d0a1e8a2a026f956015cba78812b4fb44a5ea6cbfed968c5ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised websites, suggesting it's part of a link farm designed to distribute malware or lead users to phishing sites. The presence of embedded URLs and the 'link farm' heuristics strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870864901ba---96865671338.pdf In PDF document text
    • http://serramentisiciliano.it/userfiles/files/julagufejowabebikuwojeze.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/xadudenitofi.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607294a9b686b---panuw.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/30846877820.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/nobadasifafoxabusul.pdfIn PDF document text
    • http://gyobel.itpublic/file/44524633258.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cc3e9346f---8159910194.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/48709745429.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/59193e5f55ca00050351f8986f99ed84/74230093336.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/pu3sv4c02bmhm06n0ph33lh1j1/natozewujilifit.pdfIn PDF document text
    • http://beiks.info/public/file/15788441252.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16099a0c105e07---35658461459.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/renipu.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608305ad00336---sivinifodasazudibu.pdfIn PDF document text
    • http://fruitvita.com/files/files/85543851292.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/LPIa9PGmDLg/uplcv?utm_term=pdf+to+cdr+file+converter+appPDF 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_off0000befd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEFD 5032 bytes
SHA-256: e2871964d35d4e27bd06347363e92b6859a0d6fedb58eaf077a633d01eec1791
font_01_sfnt_off0000d03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03A 10372 bytes
SHA-256: aa069bf2df053c5e9fb4a1b70c64a20ce4dce452f091d86e01c8aa6db9be9943

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