Malicious PDF — malware analysis report

Static analysis result for SHA-256 a089f9748f204db5…

MALICIOUS

PDF

87.3 KB Created: 2021-08-14 19:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2900ee180db9a77053b689ab5baab892 SHA-1: 5bb1ec09a2e073035a5e2cc34c79b847f8a42562 SHA-256: a089f9748f204db53cc225b0a3e997b265dfcff18dfcd834e67db51d2ae4f183
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links pointing to compromised websites, suggesting an attempt to redirect users to malicious content. The presence of link farms on disposable hosting further indicates a malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/d9b899886248d18096cdab8d5e0cbb66/negimi.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/1a8496f36da3fcb80c7fef90f18141c8/2905457945.pdf
    • http://gustosandvic.com/ckfinder/userfiles/files/60855102527.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0251d75a61---nupaxizo.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/64135d2ea283774903ea38c35ce34d53/26920757481.pdf
    • http://aa-nusd.jp/68088901450.pdf
    • https://lensprovn.com/ckfinder/userfiles/files/61783493439.pdf
    • http://hchs1972.com/clients/2/2c/2cb73362227bcfbd3ed6ae01b5b3dc46/File/bimudejo.pdf
    • https://cafe-malaysia.com/contents/file/xaradaronewenanukikobuw.pdf
    • https://stvorki.ru/files/file/84766342647.pdf
    • http://npi-management.com/ressource/site-image/files/nituv.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfe6745911---zekako.pdf
    • https://jungleflightchiangmai.com/Uploads/files/nojoxurabakovi.pdf
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/78065377473.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/2kpi00er5aa42paf8bsld6smfi/dazotudepedobofejekirafo.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/387b9e4e3b33e1338724b7c470694908/95873904471.pdf
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73360843335.pdf
    • http://yaqeen-eg.com/userfiles/file/bibevakuwosepef.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608718e9104c0---jesaxezoxesakezojotot.pdf
    • http://modamoda.nl/uploads/pic_lib/file/63040684349.pdf
    • https://istanbulbalbir.com/upload/ckfinder/files/31488687623.pdf
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/odf49ce5t5m35m8ilv2k8gevno/fatokoxutobogon.pdf
    • http://modern-pro.ru/files/file/69008874134.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa69a9b59a8---79974248717.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084ddd3ec2b2---49201041252.pdf
    • http://swaminarayangm.org/userfiles/file/mevulig.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+prepare+tenancy+agreement+in+nigeria
    • 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_off0000f118.bin
62fce578efc61532ab623800024da8e3ee04dff891435d02d953a44b107f32c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF118 17164 bytes
font_01_sfnt_off00011dca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCA 16792 bytes
font_02_sfnt_off000135e1.bin
8f92b70351356e554c43d096bb0d49c662d0cc4c38b09b7d5688266b9b6ff5ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x135E1 10696 bytes