Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c8902016949808…

MALICIOUS

PDF

83.3 KB Created: 2021-06-19 09:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25df0bc78bed1adc08e666508c095183 SHA-1: d99f3f63ec43ee88e73cd22bf465bfbbdff0c516 SHA-256: 57c890201694980873bc0e73212f73249b36dd84018fbd0f0b3b347ba7459905
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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 https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/80rnvlib7030h30vpp4b4a55t0/8674486858.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b012ea905f8---46619474329.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/4fpmlc4joietfv3suktj9kmuq0/ruzepavakevosikimiwe.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ccuiiqb5n6dqi8sm8qu9ev38k0/59570911586.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607309a5045c5---legenoxewolukejexo.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073771b566bb---38290123358.pdf
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/pujosibukodulibot.pdf
    • http://shreyaghoshal.com/konadnew/userfiles/file/87019410590.pdf
    • http://goldway.jp/upload/board/file/34881114596.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c221913eb65---magewilopawumi.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608df110a7447---38913727670.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/dsejtq11vhgcjf98ja4i8tpaen/puribebopubele.pdf
    • http://gourmethousemacau.com/UploadFilesfile/%5C/48984768136.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098197e917c6---30853357158.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729d5028c5e---podanefojotos.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6172e98a---36061047035.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=cost+accounting+process+costing+problems+and+solutions
    • 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://scripts.sil.org/OFL
    • 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_off0000eea8.bin
bbd411db82f7d4f1c1ed95897995e15adab3c7b966ce81b94928b23e9e131cf3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA8 5436 bytes
font_01_sfnt_off00010103.bin
514d8356b0a2e53c65ae42a4d5dbcbad4fdbac17deb546097ad8d8d3a16223d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10103 12172 bytes
font_02_sfnt_off00012a0b.bin
5f48c0e24d8aed4a0ce1ecac8d12eb7e6f158edcadbe380d4ca144b08df9a231
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0B 16204 bytes