Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f9be4d6cc9e8cc3…

MALICIOUS

PDF

77.5 KB Created: 2021-11-12 18:15:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 40cfa5f56301df3f44151fd985abe6d0 SHA-1: 3592b6c8cb45d566548df3c40cfe21fa54c7943b SHA-256: 6f9be4d6cc9e8cc34155d85a38c597200b42e1609777f847a6c50ef7bc723326
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. Although no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://bibliotheque-des-arts.ch/ckfinder/userfiles/files/80797115617.pdf In PDF document text
    • http://beijingxinzhi.com/userfiles/file/20211001115023_1880684009.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/30763772347.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/bozazokixuwul.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/79260230569.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210921_145441.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/36766585503.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/moxewawugedodawexegimiwax.pdfIn PDF document text
    • https://questyme.com/userfiles/file/suwosewowomovudafunob.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/toxufid.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/90854fe2df4c179428261f85f8ac17d7/15968563571.pdfIn PDF document text
    • http://submission.ksar.kr/pds/userfiles/files/pawomaga.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/wowamazagisubapogazetu.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/9e2f13404d9e5d9f8f47e977ed452d89/zirigojineterojos.pdfIn PDF document text
    • https://valergences.fr/userfiles/file/pifunosesix.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-10-30/20211030215621381120.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/vefafebeperu.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109141822499480.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/55250624968.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/dutotufudir.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/23622336197.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134264ea2639---4849841942.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/5bhJmFgkeCE/uplcv?utm_term=how+to+enable+save+as+pdf+in+wordPDF 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_off0000c8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B8 10776 bytes
SHA-256: e55b7641106f63e532c7cef610669d8c932909d9935eaba56b2f86adb9bf8b13
font_01_sfnt_off0000e16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16F 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_02_sfnt_off0000f890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF890 18264 bytes
SHA-256: 6ab2ffa5f7c59858eb32756bef4d4bccc39e7190c8d509a92b25627eaed55597

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