Malicious PDF — malware analysis report

Static analysis result for SHA-256 4faee5e851b16eaf…

MALICIOUS

PDF

83.8 KB Created: 2021-08-09 14:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7fdda270c7d0279364c333479c96cee5 SHA-1: e978a2289e064dd1bb93d0b708915c28bfb27fb1 SHA-256: 4faee5e851b16eaf1d8cb85bfc58bdc1bebafd74ed8328478f5649633070c18b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://queure.ru/uplcv?utm_term=exercice+adjectif+qualificatif+%C3%A9pith%C3%A8te+attribut+et+appos%C3%A9+cm2
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/47hrs76eic3gqef27u9ko8ektj/rixojuzo.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/lf0s99j4nnbeu5hq65mbtvgdu9/gesedejivolopinabigurifad.pdf
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/taxefosuxajasivonedafeda.pdf
    • http://www.flamanville-76.fr/upload/file/kasobejilujef.pdf
    • http://ttc-investco.com/img/files/fimekutarejedatikokam.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/5ea7c3c762370ebea331f285ab8b6a61/3232780296.pdf
    • http://ahcxdq.com/uploads/file/280823151696.pdf
    • https://store-connector.com/_upload_bilder/_filemanager/file/donimekananugamopu.pdf
    • https://imihwa.com/uploads/image/20210807/files/20210807072111.pdf
    • http://alptw.com/images/files/sezasabixukel.pdf
    • https://aventura-agence.lu/userfiles/files/96179260740.pdf
    • https://contabil-fiscal.ro/mm/file/31406292951.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca100b3e80---51050031852.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/83064f7527a51dbaf6e30ba3aefc3689/55943483956.pdf
    • https://marupyara.com/fotos/userfiles/file/gezujigenodadudu.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c45e7d45ba3---titawaru.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9e3c5535d---bolejuwivifiba.pdf
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/714901851.pdf
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/nobopakijafurevozin.pdf
    • https://agrilaui.com/userfiles/file/jutimedivazovokeseviger.pdf
    • http://zonweringnederland.com/ckfinder/userfiles/files/41350132305.pdf
    • http://balogmihaly.hu/UserFiles/file/bajoputimalevatepar.pdf
    • https://aonetreks.com/uploads/file/kujasovopifugirivirivinu.pdf
    • https://lacaune.hu/userfiles/file/73980259821.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc59.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC59 16792 bytes
font_01_sfnt_off0000f470.bin
f21a0c45e433a2df2978a27624b6d25d088aa28be336bffa6bd74df2433b0582
pdf-font-stream PDF embedded font (sfnt) at offset 0xF470 11812 bytes
font_02_sfnt_off00010f94.bin
de43833934a6c63b38eddc89e6c077a16edeeef3cf90fc59de78aa645b7e756e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F94 18724 bytes