Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4bc702d059ce62f…

MALICIOUS

PDF

80.4 KB Created: 2021-09-19 19:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: db69b57ec8b7988d5cd881e977b514dd SHA-1: 63775c61c9fac823d9081f684aeeb1de4ece5973 SHA-256: f4bc702d059ce62fcea858fe8f8b8082a134ac205002478fbdf238f8b7ce0936
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on disposable hosting to potentially manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://huntic.ru/uplcv?utm_term=download+andy+emulator+for+windows+10 PDF link annotation
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0750d12c3---nezaxugusejejumavapujo.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/52670414339.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/41125409175.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/6a76246b3d53618de8879d2852c04fb8/lamibarun.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/tutibaragodibibojadafe.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/vemapugojotus.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/48471901063.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/piwaboves.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/lifubaxowafisap.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134db137b7c6---59934930091.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/didakewajuv.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/lomuvutajetuguz.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/20531436833.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/ropiniboxigafu.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/2204021801.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/ninug.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/gamovumatewalinis.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/7929208820.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/71400132016.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cac3ed290---14099442230.pdfIn PDF document text
    • https://thehouseproduction.net/file/gufemajogaf.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/kopiromikef.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_off0000d78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78D 16700 bytes
SHA-256: 933f3f676860b97b4e4c2a819be6af6539dcf44d6c15deb0250163923b42a0b5
font_01_sfnt_off00010242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10242 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A59 10992 bytes
SHA-256: eba5d0f0edfa092a7b66a001ea7f53cdf67e09a6a0b9e446f55354f4576a9900