Malicious PDF — malware analysis report

Static analysis result for SHA-256 628d9888176c2347…

MALICIOUS

PDF

71.1 KB Created: 2021-09-18 15:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bfe9784e06fecb942ccdcebdf2071a06 SHA-1: b5ead52ef68a831c55f8020be48619eddfabb16f SHA-256: 628d9888176c234734fdf1b72b3456fcc20991acb40cf3c5c73d8d2cb9401e41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and content suggest it is designed to lure users into clicking links that lead to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://archism.ru/uplcv?utm_term=lock+pattern+lock PDF link annotation
    • http://pinedafoundation.org/imageuploads/file/61840832176.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/scj932hjq063qg4pkeoo9uetvm/xilekufaboledakasugo.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210902_125734_3735.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vajuzitimuvifigofexal.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f63e4a4ce---16703129956.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/pogarewasa.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/40d34b879003ff53d89e4851d9014033/4970933656.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/siwamime.pdfIn PDF document text
    • http://thaide.org/userfiles/file/ximimiletuletarakumowo.pdfIn PDF document text
    • https://ratoempat.com/contents/files/63957389427.pdfIn PDF document text
    • http://meta-min.com/files/10852496667.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/2bee145d840db2d927b4584c552bea92/99430635167.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/misogojamanaverox.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/fesugin.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/valerati.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16137d859c0c64---36576941901.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/91219412530.pdfIn PDF document text
    • http://evola.it/userfiles/files/nimivaki.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/4175084168.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/gibesalelejatupubox.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/69102655052.pdfIn PDF document text
    • http://imi.vc/upload/files/68076313281.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_off0000b517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB517 10156 bytes
SHA-256: 6dcb1cc445909c38ea95d28addb13248deebb9767d87f1a7a4bbc02d08998ca9
font_01_sfnt_off0000cbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF3 16900 bytes
SHA-256: d59e7ca4c107a34b81685e4d603bb618dbed8b06de9cd2d6392865d13e8a4c1f
font_02_sfnt_off0000f76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1