Malicious PDF — malware analysis report

Static analysis result for SHA-256 787db69a2abd03e1…

MALICIOUS

PDF

88.4 KB Created: 2021-06-25 12:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1be9c15f07f39b50ff445bae103cae87 SHA-1: 114408f730e48709ef61284004f33993722ab421 SHA-256: 787db69a2abd03e1c5c14fc03d21a45decfac6eb50d2f8ad084d09bafbb9686a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites utilizing the Formcraft plugin for file uploads. These links are likely intended to lure users to download further malicious content or engage in phishing activities. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160708c8db7afa---verezubu.pdf
    • http://accessiblevehicleservices.com/userfiles/file/13493046994.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7e5eea2c3---6872643976.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082feabc7e52---72677645875.pdf
    • https://akemi.ro/hirek/file/pesapatu.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab6e58c229---larivusazebenip.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/5b5112d4867b11890cb9c377271a2f97/lefirinipuxif.pdf
    • http://vhktn.at/images/content/files/sikibejemagefiji.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/0c3ce669aa7841157da74bba7396e6b9/zewamakuwevakilelege.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086e81d20b04---demonozudusumatemup.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/lq36tkfj3lu6iu3gsts6nlss03/82388775167.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a796b2a9795---xitezejadovivudisujaf.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/2961778794ad60a9434c9cf58bd2d442/60900719570.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/26cad5aaf2abfef331e898c3f95c88f6/rixirufo.pdf
    • http://www.contectrade.hu/fckfiles/file/susoxuxijerogir.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=psalms+for+protection+against+enemies
    • 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_off0000f80c.bin
f3467142ef08f68c88424b54734bf1d94695f1131b04291565a450c6207ace7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF80C 16776 bytes
font_01_sfnt_off000123b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123B6 16792 bytes
font_02_sfnt_off00013bcd.bin
ad7057793933f937575760bf496367a8ce35772ce4215f8c72107732113972d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCD 10824 bytes

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