Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91f4b453a27db96…

MALICIOUS

PDF

79.3 KB Created: 2021-09-07 11:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: ba89d542b6f769b19862953ced137fa7 SHA-1: 623ce5971abd8721c5b2e2ea3f03c4782e1c0101 SHA-256: e91f4b453a27db96b17c5f7092c535ce436be66f7dfa3daea2dbce80ad744e9c
204 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a clipboard-command (paste-and-run) lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aire-limpio.com/img/editor/file/buwonigakale.pdf In PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/foloxuwibagozes.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/f3532ecf318e1fd595ac99974a9a0f0b/memijivopireb.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/xejaripalasomet.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b878eb2c27---zoxobelorav.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/fofefumimin.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/jedolol.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/xugivatamaf.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/31382952847.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/8vtfqct0lopk1l1vi3guju4kuk/jekivesedagelava.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/414e4df58eb95450b89a2bc18acda482/96013370614.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b889f823356---lisoniwuguj.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab6c8dbd73---68297633856.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/fnj74s7ask01qrj4u51e1spgr8/gikovo.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/48586211047.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e406f60411---16424198211.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/cf438a50aa1a856a97d3197f288fa1db/bimajomovuzejodovebuse.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/9bc262c2dde56986ccd6e5f321519960/bexadaloxanuwefeboxe.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/a9lkspq8kputq5554untm1qfd4/13553216035.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/pesavutesumeja.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/vusorazuz.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/43361517678.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160fe278b56027---magezaruwelopigomorirumuf.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c88e286ee8---batugugawoxilufasiben.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/61596881819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=create+pdf+in+php+using+fpdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000e6d4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE6D4 10744 bytes
SHA-256: bf7d59d7c305a6391a06b0d80ca24b754a62ac4a2b8ba7dbf06efa4a742bc539
font_00_sfnt_off0000cebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3D 18460 bytes
SHA-256: b7a039f46af8f6d15201114ee79efba34b119745b3efad622606c07ba94023a7

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