Malicious PDF — malware analysis report

Static analysis result for SHA-256 42bb042a4bf562c9…

MALICIOUS

PDF

83.6 KB Created: 2021-06-30 02:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1ff1bfa564b2d6c54193de9025de696 SHA-1: 09451399a3785571238659972bd6658564c3d73a SHA-256: 42bb042a4bf562c967561c9d26b9a2fc6dbf90e1c6cd7a5bb4cce09ec0244a9e
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The file's structure and the presence of multiple external URIs indicate an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://nexxosrealty.com/userfiles/files/bokoli.pdf
    • http://lavalnerina.it/userfiles/file/11175532822.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/430f8hl5jp3442ajbverbpeeq6/wofigumufudiso.pdf
    • http://davidhammerstein.org/userfiles/file/kaxurilisonex.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/23543296025.pdf
    • https://agronlogistics.com/userfiles/files/17670541393.pdf
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16245754190738.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba1e2914c9---23723834697.pdf
    • http://mgocsm.in/userfiles/file/25354651159.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/0c95k68d8ib0pr9ns5jp92ltt1/xevabizugozopuzikiwujubog.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/1678b8f6e2cb9e8d5dd35e0d4b846e81/faridipununepajibanix.pdf
    • http://pmteventures.com/clients/5/57/576e8e71b788aac95a268099fab76a3d/File/54781494039.pdf
    • http://constantemail.com/userfiles/file/162325313271954722365.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/4ea2823fbc4a1ec7690c4ca35b1b3f04/76859647998.pdf
    • http://zuche0551.com/upload/file/gujafadizekabawarofa.pdf
    • http://botosani.ro/img/uploads/file/2779293555.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/d17264165ba55f656933f1bc839eeced/fomajifupuwosatad.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160accd610a6f3---63073312795.pdf
    • http://wonikqnc.com/upload/editor/file/1624359866.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608adf520c5cb---48807272220.pdf
    • https://samsungdvmklima.com/upload/ckfinder/files/42207162319.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=chartres+cathedral+roof
    • 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_off0000e749.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE749 16792 bytes
font_01_sfnt_off0000ff60.bin
30d0157462f0c619c3a255975b55a5cd43455922f2b4b822f72fb0a06ec26807
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF60 10408 bytes
font_02_sfnt_off00011723.bin
2bfc8ad173a928ab4527f532b65ac116813d46434c0ae8db4229ad62ffa8af0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11723 16388 bytes