Malicious PDF — malware analysis report

Static analysis result for SHA-256 19e35cab453a3f1f…

MALICIOUS

PDF

73.8 KB Created: 2021-06-09 01:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 606bfde21f000708eea905210c19c344 SHA-1: 47ea2b9459f4715045ea889ab0cca412be8f627d SHA-256: 19e35cab453a3f1fe08d828cc7ac8a7230fe666d80344774528352e06616768f
172 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and multiple URLs pointing to compromised WordPress sites, suggesting it's designed to trick users into downloading a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely responsible for initiating the download or redirecting the user to the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=solution+manual+mechanics+of+materials+10th+edition+pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090be1c5a854---bubemanotebajemiwerivisus.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/4521e3c7889d80df0ff1832d32d819f3/deboterufe.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e34c97e8f0---31833352850.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccadac4ad7---77722280706.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8daca54a3c1f1057ca06238985a1d5ec/vugemagijoja.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa49ed996da---fidizorubinekifajilasu.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/c5f5c777282112426f52915a99048a9e/31143760503.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/ah7rakek54mgovq3prncbsgih7/90390837486.pdf
    • http://kursadowicz.pl/Upload/file/16616955732.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/dd2i0uv6gc677hlb3sntg1l1v0/5486972366.pdf
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/4c02c07d0acd65395ae4b46862f55710/59116562578.pdf
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210606065037868871pi49eg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e200.bin
d67161284c8255d72c0f8647b8a59899a364068dfd0290bb78ef881cc16aceae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE200 5692 bytes
font_01_sfnt_off0000f537.bin
3bf516d63b304dbd6b55d441352baf63a35c7450f16162f6d11313851044ffb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF537 10844 bytes

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