Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11fa88400afb7df…

MALICIOUS

PDF

86.7 KB Created: 2021-07-01 14:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fae21e88fb8b7b490c5074859e3ee856 SHA-1: 8df67de42dffe4fd64e8f01386d46a833d48ed5e SHA-256: b11fa88400afb7df2fcf2355487169efd3d1d076d4c9373dc4059aceb50a6245
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document's structure as a link farm suggests an attempt to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0e1b37bc1---54149738500.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16070510415870---sesiz.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099652de1aff---52698292972.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b793f2d95fc---81291218009.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/27354ac510613085df9df03e3081809e/85811335794.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/d13b55c726d407814abdfbf7ea3635f8/83537792548.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16095b50667342---rudalemetevozafe.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae83fd4c32d---84919210371.pdf
    • https://nhachoxebus.com/upload/fck/file/wunasi.pdf
    • http://cl-metalparts.com/d/files/ririzatonifaz.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/94fe08be1006923dbf1def22296d2c93/zepesaxojutevanazif.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cb603a2d3---gugafedofodarune.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608280cba7740---tijegilenu.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/23b15f13edce4a85596302b2c63db042/pubenokurot.pdf
    • http://codemessaging.net/ckfinder/userfiles/files/sivaropa.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/0d6bf34ec7b05c3091487b399c5542af/fojaresimen.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078f10b43c30---wosilisifefopu.pdf
    • https://tonwen.org/userfiles/file/fuzunejebinonem.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d9117b0489a---41567215951.pdf
    • http://andlupa.com/userfiles/file/26703710574.pdf
    • https://ev-owners.jp/userfiles//files/xumosatixizojati.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a06b57cab3---2711617061.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/lepujasixuzumuxagajida.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/70179436543.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=indigestion+cold+sweat
    • 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_off0000ee8c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8C 16792 bytes
font_01_sfnt_off0001069e.bin
1220882030e613e14561b39e1cd5f4ea8fd37e1c4cccc61c5d107e74caae56e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1069E 17424 bytes
font_02_sfnt_off00013462.bin
1c5ceb49a554cb53dfd2f5c5ac1f426c578e943c181086d30cec791dec13a6f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x13462 10480 bytes