Malicious PDF — malware analysis report

Static analysis result for SHA-256 6baf8671d67c81c6…

MALICIOUS

PDF

73.9 KB Created: 2021-09-12 08:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39de25f115af891476479ff249a1b3ee SHA-1: f9d9b28d67dc830950a8b74a52aee8a768e8ec94 SHA-256: 6baf8671d67c81c62fa4c322fd82e55c08580c2ac40ff2f0b4c34ba8dbc47b60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of links pointing to various domains, many of which are identified as disposable hosting or compromised CMS uploads, indicating a link farm for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://ski-experience-japan.com/images/blog/file/tovukerijizanatomumam.pdf
    • http://dongamold.com/fckeditor/upload_files/file/tupuvepepuwavu.pdf
    • http://kutscher-customs.de/gfx/userfiles/files/jotalogutunisixufi.pdf
    • http://teresachild.com/upload/files/40997590959.pdf
    • https://thisissati.com/userfiles/files/xegurunenaj.pdf
    • https://ribaczpeter.hu/files/file/78765691331.pdf
    • http://wienbildarchiv.com/upload_files/files/11547559783.pdf
    • http://yushendesign.com/images_fck/file/1631060911.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613674ce30669---rigunekobo.pdf
    • https://betentour.com/sites/default/files/file/77649678470.pdf
    • http://cn-biyoute.com/d/files/mirur.pdf
    • https://airflow-skateboards.com/upload/file/lubewulimalasiwatoroga.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16130c87559fc1---fidinenonutizuravuvasixe.pdf
    • http://electronicaindex.nl/images/uploads/4332563177.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161353e85c059f---36187858570.pdf
    • http://talesma.com/E/file/dosudojonezite.pdf
    • https://lenaoyunlar.net/calisma2/files/uploads/83444901736.pdf
    • http://www.valathors.com/ckfinder/userfiles/files/46638209144.pdf
    • http://spokoino.ru/i/upload/files/31355406486.pdf
    • http://ccspatti.org/userfiles/file/27690577119.pdf
    • http://creativetechno.in/userfiles/file/porepejekifofetapi.pdf
    • http://first-group.kr/ckupload/files/bubamisumu.pdf
    • http://danieldesignpro.com/userfiles/64837344049.pdf
    • https://iveducentar.com/uploads/assets/file/56040737314.pdf
    • http://getvisa.ru/images/File/fokinujenugonulixirap.pdf
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/6534326779.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=wobbly+life+apk+download
    • 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_off0000bdae.bin
866645a1d5b8d1f74d2cc2d87d8e0c5d26f7f8910b8f80ca9634aaed98c65dd8
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDAE 10552 bytes
font_01_sfnt_off0000d5a3.bin
510216b9f0525e9e5d97fa232a6ba237f972f0dce7a677de2724e4a690766cd5
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A3 17316 bytes
font_02_sfnt_off000101e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101E4 16792 bytes