Malicious PDF — malware analysis report

Static analysis result for SHA-256 8147f724002c06de…

MALICIOUS

PDF

81.2 KB Created: 2021-10-07 21:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7a50887bf68866b50872b029d5524df0 SHA-1: 535c87d2c0d1f734b84b614898d5209926c72d72 SHA-256: 8147f724002c06de7662958189d472e65ea7c982029b12f88fe1adc533140999
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but reinforcing the nature of the file as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=transition+metals+valence+electrons PDF link annotation
    • https://vgk.tw/upfile/files/2021/09/24/35971664875.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/73580635924.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/zilezo.pdfIn PDF document text
    • http://seatraveltx.com/uploads/files/59957262869.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/lofenuzovagopogiwowibodo.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/11639510993.pdfIn PDF document text
    • http://crm333.com/documentos/file/vurodorekubidomofote.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/joluvila.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-23/20210923212117225408.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/goxekutidinuvugof.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/86631178751.pdfIn PDF document text
    • http://profstil.az/userfiles/file/zoxorubifizugowusofo.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/38259716986.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148f2057e3a5---donudewudozewe.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161470fe0d3457---josotavirisutaxam.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/21183085067.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/33786190119.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161595f9ad3479---71265102233.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/59842765543.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/vuravexerowukuf.pdfIn PDF document text
    • http://skia22.ru/pic/file/10653695215.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/41778500481.pdfIn PDF document text
    • http://linza-market.ru/upload/files/45235455459.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/lelikojupi.pdfIn PDF document text
    • 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_off0000d826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD826 10420 bytes
SHA-256: eabc7eafec29737ef9bafe1210860d9afa9b8768dfad92593fe637834ce638e6
font_01_sfnt_off0000efcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E1 18324 bytes
SHA-256: 8579a005a6a88c7caf5af5536de9ee7e0bc68af2018a38df5d6d8ec0938d693e

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