Malicious PDF — malware analysis report

Static analysis result for SHA-256 d933930dcf6fb369…

MALICIOUS

PDF

103.5 KB Created: 2021-06-27 00:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d4538e5681461f85501121a9fd1466e SHA-1: f55d628807a397b5cc55778177d89d35d5eece9e SHA-256: d933930dcf6fb369f3b9541286c894f3e7a9351fb61f2bd193bd7a7e72c1e263
156 Risk Score

Malware Insights

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

This PDF file contains a large number of external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded links point to various domains, many of which appear to be compromised or disposable hosting, further supporting the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=density+of+solid+liquid+and+gas
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a527103ce7---kiwatuwapobekefe.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99368099f9---vibekirosokivujifuzezop.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/bdc2aff8d5d207466032c834132afc36/pumugelujalo.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8423646bc40b40db0d1b2711962d8fae/pazufenemuzajep.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/tojudepofixej.pdf
    • https://betalinktech.com/blmedia/file/kedegadorubinoxedow.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/3l4av0irbuaggip0uo4etsjov7/99899011931.pdf
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/bujimevax.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d9241ca9f---31797943602.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083162475dc2---76053714901.pdf
    • http://gelikonline.ru/content/Files/xowaligotutodolipufavez.pdf
    • http://wo-kop.pl/userfiles/file/digovejukevu.pdf
    • http://kme-kme.cz/files/file/moregepi.pdf
    • http://myafmc.com/clients/a/a5/a51d49d85de18111a3d718c63a5e5081/File/35860466076.pdf
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/c473d24a7627cd875433b901e5b40a3d/jafudit.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609512a43a84a---57295484755.pdf
    • http://chineseclothingonline.net/File/wumadadabubumazagixu.pdf
    • http://degrossier.nl/uploads/file/41538150815.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858f7ca4fd1---jizivetutakepek.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab9dc5a529---27886592133.pdf
    • http://acpiindia.com/userfiles/file/90197605403.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/2hdk5t344u4vjtjv34dequoku0/bimafatupadoxu.pdf
    • http://travelshops.pl/userfiles/file/77072326259.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/f63f84e943b79d52e3528305f46aeebf/luxajasukav.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/0f47cab75e54eb75cca2787c790f11b8/18956798141.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/791158dd068936ab5d555c2d79d27ab2/vimejavulikekawis.pdf
    • 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_off000131de.bin
323f7b9bf28db6c00cb6a550c85e7ebf27365e0e504616b3ed09add614c8c18d
pdf-font-stream PDF embedded font (sfnt) at offset 0x131DE 10788 bytes
font_01_sfnt_off00014a63.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A63 16792 bytes
font_02_sfnt_off00016275.bin
1aa5f8fb07c67ba598a5c08abfd59770fd777d1147352d35b85d62955644d956
pdf-font-stream PDF embedded font (sfnt) at offset 0x16275 17368 bytes