Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c83fc8f3592ee1…

MALICIOUS

PDF

75.5 KB Created: 2021-06-02 18:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89f9b694850cf5c5b2a0d6bd1d00c8dc SHA-1: fef0334608d9cb6e930005d6adbc8cb5ae9f42ba SHA-256: a5c83fc8f3592ee1b339d80dabf0d834bec28e7772f80b1abea6f7cf6a927659
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to external websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest an attempt to redirect the user to a second-stage payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://smidgel.ru/uplcv?utm_term=how+to+take+care+of+ficus+microcarpa+ginseng+ikea
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d669d53fc3---16263311481.pdf
    • https://al-farh-iq.com/upload/userfiles/file/98438446402.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6ad230460---84965609542.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a905d14e299---jumupevamo.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/u995hs4c3jrr8h16hg93igldo4/sivuwonixigitewizakipelu.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f182ac52f6---82533834794.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/eb5611c9eaf3d54e5abaeaa530a13332/42076354814.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/9324623db1c96722f8671085475a3eff/wopewugavenux.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d20f97fa3---pufarabajirenemofusedit.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160843f954a32e---xiwudapep.pdf
    • http://bocghebinhduong.com/media/ftp/file/dufojema.pdf
    • https://abofahed.com/userfiles/file/79110915347.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2b75dcbcd---sodozuziberawevivevuzanir.pdf
    • http://backupcenters.com/userfiles/file/kabatuvajujazojixodasogaw.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/922dc51f2b62d76f8c9d87d8a8eb4b13/26937584188.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775ba8b3b65---20911984321.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
    • 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_off0000d08c.bin
fb52a531f850fdefc15ec58db33204b7a11a02bd5ceb4b175dd55083173ec378
pdf-font-stream PDF embedded font (sfnt) at offset 0xD08C 5420 bytes
font_01_sfnt_off0000e2fe.bin
32753fad5940e36bfced640f4f8c3ce273d397a55b60fae3d8d372574605bf7d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FE 10324 bytes
font_02_sfnt_off0001063a.bin
8a08fd38df4366ba2d9dd5b566b44058b30e52d299337f7f9265051e0edf442a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1063A 17648 bytes