Malicious PDF — malware analysis report

Static analysis result for SHA-256 e79efaa101c2d877…

MALICIOUS

PDF

91.3 KB Created: 2021-06-30 11:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b69860b0053aeb7133fb85e9c219badc SHA-1: ec697562dfa288f66d36766426db65adabd73194 SHA-256: e79efaa101c2d8778bc6bff58669cef7e5a4870a8624d67593bd1d502b70cdac
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://ever0036.com/assets/uploads/ckedit/files/20210529205349.pdf
    • http://rotang.net/userfiles/file/74207814004.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad692515b0d---97169630048.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/7a60f9e2fed6359be854407c32464559/kaxumokonu.pdf
    • https://247christianity.org/fckeditor/userfiles/file/859984193821624367187.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0cdc3a4517---81537613224.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8cbf484144---92572970919.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608a27885bde8---75901388733.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f9729dab8---ketukozog.pdf
    • http://sammyuriasproperties.com/userfiles/files/4327797760.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922965afced---62753783282.pdf
    • http://haumeaonline.com/userfiles/file/39427755150.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608105727e955---64903848104.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756d2b439a2---pododajodunetudegat.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/3037b70834b1229923f832b8304d9ba8/zoliga.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608c002825dfb---barezoxadowenuxowuvu.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb644711f1---82713188770.pdf
    • http://wghsclassof69reunion.com/clients/b/b3/b33699c65747f61a54cd06c2fab73d22/File/tovodixozon.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de43f1dc6c---sezuxaraduxe.pdf
    • http://chiari-web.com/ckfinder/optimist/files/99680261160.pdf
    • https://advance-pack.com/editor_upload/file/lodagapaneribujuzu.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/0eac0bb620cf24eb93630f9b082c2282/37063743451.pdf
    • https://peilimineko.com/userfiles/file/41739047577.pdf
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/11184776013.pdf
    • http://splogservice.ru/content/file/lumetirovujozuf.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=where+is+comma+in+address
    • 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_off000103e9.bin
c7a377dc88825f1b8132d71019bf13d5f617889a95b3ea0479b1e8004044314a
pdf-font-stream PDF embedded font (sfnt) at offset 0x103E9 17044 bytes
font_01_sfnt_off0001304c.bin
7a823e386d0e7216f1b9df81fb88883a6a968e0641123207b6f9428479ed8b4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1304C 10484 bytes
font_02_sfnt_off000147fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x147FC 16792 bytes