Malicious PDF — malware analysis report

Static analysis result for SHA-256 b110378e9e8a879a…

MALICIOUS

PDF

90.8 KB Created: 2021-07-19 13:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 856313712359f9504db5a2a0d22d0a02 SHA-1: b4107316c5bb706868e2296c5a781645a28d7b0f SHA-256: b110378e9e8a879a3f6865d97232f33be622f847d1a0b521e8c9549ae1efcf7f
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 as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to lure users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd0083dcdf---12223349078.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/cb3a66c45adbeb97eac22954e7a86dd2/93718336421.pdf
    • https://bloomland.com/sites/bloomland.com/files/kebowezovomumuvazarib.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/9f8c0b364ae5dfe2fec51d8ef3dbc060/mameva.pdf
    • https://turbooto.vn/upload/files/16881532946.pdf
    • http://biirbeh.mn/images/content/file/51223897997.pdf
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/barunenasegalotiz.pdf
    • https://siroyensao.com/upload/files/tugefapaxizorufepota.pdf
    • https://baoyi-chuck.com/ckfinder/userfiles/files/todarakuxasama.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960eecf0a60---lagovo.pdf
    • http://pphu-joanna.pl/fckpliki/file/bavar.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077604ca9b98---97425392432.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/979082187fe2fdffd365d91d3dc8da86/tiwota.pdf
    • http://ixtvs.de/_upload_bilder/_filemanager/file/27719560813.pdf
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49229590933.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/mov9pu4a1mbi6dovigipara0c7/kakitinivib.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/aafa2f3a5beb9e845a00d3d87ac95c1a/xorumemurokemaxofiwefowa.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/538c95d095798cab3b35f09e35cacdbb/70797140511.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16083f12979573---14766220772.pdf
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/gupisugikonad.pdf
    • http://quickvideo.nl/userfiles/file/8165062403.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=what+are+your+salary+expectations+for+this+position+answer
    • 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_off0000fece.bin
b11e98e2ee73c0a06c6e8e863316ffccacdfeaa7b12266a95a7a983495966528
pdf-font-stream PDF embedded font (sfnt) at offset 0xFECE 17356 bytes
font_01_sfnt_off00012c1d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1D 16792 bytes
font_02_sfnt_off00014434.bin
76100945ee78b32f721a039130d1dd62860faa22f9ed1e135667e8f2948169f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x14434 10972 bytes