Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ba77371d2deac7…

MALICIOUS

PDF

68.4 KB Created: 2021-09-10 20:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6868cc024fb250fe5aec4f91eb7465d8 SHA-1: dd30167a1df1e4561d5999ceb854ae0c85d76884 SHA-256: 10ba77371d2deac76184c2f4110820a4a7b80b2731d481bb1c05d1c1871f1fb7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous links, including those with UTM parameters, suggests an attempt to lure users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7737

Heuristics 5

  • 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
  • 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://oniceh.ru/uplcv?utm_term=2d+elevation+of+house
    • https://remini.hu/userfiles/file/76847976765.pdf
    • http://lse.hu/userfiles/file/54148824417.pdf
    • http://burchiellati.com/file_fck/file/runadepusewawa.pdf
    • https://bursakaynak.com/userfiles/file/39011068385.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee7ae441d4---bipovusurifiteb.pdf
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/nofaberepup.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613904ce7af24---56435816456.pdf
    • http://prodottoitalia.eu/userfiles/files/53899991366.pdf
    • https://hotnews.md/upload/userfiles/files/bapivekipewu.pdf
    • http://secondhandgraphics.com/usrfiles/file/dikedigolovelexokezo.pdf
    • https://podimercrm.com/img/files/68340030935.pdf
    • http://progetec.org/userfiles/files/87978223978.pdf
    • http://metamorfozyayincilik.com/userfiles/file/84289278579.pdf
    • https://europawindow.com/app/webroot/img/main_content/files/98133872322.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613301fc5a837---kodotapavirigodemoza.pdf
    • http://kazuma.ru/ckfinder/userfiles/files/pagabe.pdf
    • http://hungthanhauto.com/luutru/files/19244898073.pdf
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/nikefa.pdf
    • http://pedraferro.com/files/files/mekevuwunutiraxoj.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139f981681ac---nadidudigisuvonefiron.pdf
    • http://tech-in.info/bramy/userfiles/file/78418783989.pdf
    • http://tischlerei-schlusche.de/sites/default/files/file/50227398854.pdf
    • https://keongracun.org/contents/files/65032652531.pdf
    • http://855solution.com/htdocs/cljr/data/files/69320985804.pdf
    • http://terwaarde.be/ckfinder/userfiles/files/85776618772.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd4d.bin
ff768b18b7f08fae58f23a5c8228462e2a42936628adefefb5ea09b764373cc6
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4D 17160 bytes
font_01_sfnt_off0000f9ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EC 16792 bytes