Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2216302ad7f663f…

MALICIOUS

PDF

109.2 KB Created: 2021-07-01 00:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 263e60d17e78bbfedc59caf6415b2769 SHA-1: 2955f014844525c3d595baa6914c9a30a8718896 SHA-256: b2216302ad7f663f7a403be55618438c9aa06c33e9b09fc7124f822aefe05219
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of numerous URLs on compromised CMS uploads suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/dd2d90258c8bbd87620bee417edc1ee3/14491050176.pdf
    • http://diysmart.net/userfiles/file/peruxudepe.pdf
    • https://clinicscrm.com/img/files/monijijijuwipopalor.pdf
    • http://flatadministration.com/uploades/fckeditorfile/52545553488.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/8nshamjr8gcu1v5bsfc5645pqe/34188148021.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/8c516096092bf4b7994ab60b8e18bfe5/wepubu.pdf
    • http://zabradli-znerezu.cz/userfiles/file/21672268061.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/96f35deb51e19659d2d3cc7c0ed6837d/73473431184.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/3782284f95824458979f367679e673c1/36978286134.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c39525b2c20---82509142784.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608304eb3bc60---nikuroletisiloloketeme.pdf
    • http://gayaarchi.com/userfiles/file/20210623214812.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070f21c53a79---xoxagoredemozokonuvojujat.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16094be894b849---22318192261.pdf
    • http://muslimofwestbengal.com/mwb/editor_upload/files/fozujaxamakovizanumajid.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8405bbafc---5029202973.pdf
    • https://an-professional.ru/img/files/file/wuripi.pdf
    • http://laclonghotel.vn/upload/files/39242315571.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863a70af9b6---fijojobuvalifepomu.pdf
    • http://sllight.ru/design/img/upload/file/puxazegavepizora.pdf
    • http://tourbusan.net/FileData/ckfinder/files/20210608_8087E89A24EB7B11.pdf
    • http://laduses.nl/image/file/funixetutur.pdf
    • http://teplospectr.ru/images/files/84059727415.pdf
    • https://muguet.fr/sites/default/files/file/19335302879.pdf
    • http://mai-colle.jp/userfiles/file/ninusirafak.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff5fceffec---kulelokeloziginepog.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=synthesis+of+nucleic+acid
    • 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_off000148c4.bin
08e518ec116894d9df4934597df9cfba5892c90bddbffd0a22256d14d845b54a
pdf-font-stream PDF embedded font (sfnt) at offset 0x148C4 17516 bytes
font_01_sfnt_off00017695.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17695 16792 bytes
font_02_sfnt_off00018eac.bin
193e6e69731f03ea0865419eb3fc61964b6ed4e0ea379a2999efa6b009cf972b
pdf-font-stream PDF embedded font (sfnt) at offset 0x18EAC 10760 bytes