Malicious PDF — malware analysis report

Static analysis result for SHA-256 d20f714b76bee1bd…

MALICIOUS

PDF

84.7 KB Created: 2021-07-03 11:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95b42beab7045b578add5606f963eddf SHA-1: baa2a11ab26b113520ab897ce90fe12cec31a6e3 SHA-256: d20f714b76bee1bd312823712bb9167153663dce4c0b47f3d826dc3abac40ae6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload directories, a common tactic for hosting malicious content. The ML classifier strongly indicates maliciousness. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it is designed to redirect users to potentially harmful websites, possibly for SEO poisoning or to serve further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/5s68d9eqcvu89trlvlia2jaufs/mekuruwobosenojaxa.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c52becd8554---velanibasikezotivuborano.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/13o5a2ce9leh6k7pjbdc8ququ2/95579305029.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba5af843de---40671845268.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/fu2tbqjcg8khaovl9d6rc26ts9/3743279398.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa532000eb---wukimame.pdf
    • https://blnk.eu/userfiles/files/33357556711.pdf
    • http://atenngo.com/admin/sites/site/documents/68563590122.pdf
    • http://www.specemc.ru/upload/files/woxesezipa.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848c447730c---68295862579.pdf
    • http://casaatlantida.com/userfiles/file///devafagozizawipususa.pdf
    • https://whitesal.com/data/images/file/1167_20210619232525.pdf
    • https://dildendilecevirievi.com/upload/ckfinder/files/59559863727.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079225580b76---98298420029.pdf
    • https://ourlady-schools2.com/userfiles/files/45759066290.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1236ce6ed4---julirowezi.pdf
    • https://blogsma.com/files/50179186961.pdf
    • http://antifftech.com/uploadfile/file///2021060112591738.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf2231ac71---siribos.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bdedd8b65---renelavu.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/fa24533c0a87fbacb9987ea08929c0a1/xizur.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607239f462f3e---narevik.pdf
    • http://dashoernerboot.de/userfiles/julilekexa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=lost+and+found+pets
    • 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_off0000ea6f.bin
810ba0bf7def40e067d11eb4a9dddafc3d2a62895882639972bb9d773b9ccf0a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6F 17048 bytes
font_01_sfnt_off00011674.bin
d8ffa561bf6ae2a278612f68326f56721d9ee5170b1274c448c14f6473dffdb2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11674 10308 bytes
font_02_sfnt_off00012de1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE1 16792 bytes