Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b97ed96efe1546…

MALICIOUS

PDF

88.7 KB Created: 2021-07-02 05:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7754b27e1d123a584d01abb7650acfec SHA-1: 25b60a6c9fc3f0cc38df766c0e104278c24f1fb6 SHA-256: 21b97ed96efe1546a13267d7104297651d78facfb84062be39fa40821f07003e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to lead users to malicious content or phishing sites. The presence of multiple external URIs and link farms indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://wildpflanzen-planung.de/file/60664632840.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7d243fe35---26928026836.pdf
    • http://extracam.es/app/webroot/arxius/file/18678526332.pdf
    • http://ipllaser.in/uploads/majilosiruf.pdf
    • http://elcampoeco.org/FCKeditor/file/fulupejalaxigi.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/hmcm3jja0jnht1ng4mf736mtq1/51635351846.pdf
    • http://kamennykoberec.eu/editor_uploads/system/files/kofelozafelimenekira.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160851991028bf---33188519756.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/351ee98e8d15dfe30f4fe00b48cb374e/8900217715.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d59c11c980---63615485426.pdf
    • http://sicompk.com/survey/userfiles/files/fazamugulemiveri.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/58a13c5f64ab696ab13e4c414c60d202/49625122565.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/f57686bfba001f2434821952e2806278/xuxonozekipaw.pdf
    • http://cuatro-pr.org/sites/default/files/file/munujosowitonedije.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086415b545ca---kopul.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/b768f7f1243371b44e7994959ad11c05/32835082016.pdf
    • https://miaousland.fr/ckfinder/userfiles/files/18484032671.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b55226ad5---64451365068.pdf
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/79210066983.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98a1044cd1---25226411714.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d276ae09d6---41511116883.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/o9q88gknnec9nlnig0kf0uhdea/pixopirigovozuwawuxute.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b322b0d2dc2---lilopopotolasoneroxi.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/506d3a339543e5bb84dc711bcb0a82ce/54276950990.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=wx+psp511+thermostat+manual
    • 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_off0000f69a.bin
a3dc67c29c1002fa9e951192a81de2a737dc2190718059475454d9d28f1a42db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF69A 17424 bytes
font_01_sfnt_off00012487.bin
3e72f80f0ea6d32ebe9c10958662f1ff6159425e2a4a98c4335ddf9db6f24221		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12487 10808 bytes
font_02_sfnt_off00013d71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D71 16792 bytes

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