Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3185f9d0f0790f4…

MALICIOUS

PDF

71.1 KB Created: 2021-06-26 06:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af05e99de16a0c15d3101405fc98b094 SHA-1: 09bafebe1fbe6a6881a58e8b26e6bcb5decc150f SHA-256: b3185f9d0f0790f4428dbc782b744a4558ee13b9868897c1d1278e59a83ff726
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to direct users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://irlanc.ru/uplcv?utm_term=memo%27s+mexican+restaurant
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4bb7178759b1245ca6019ab8edb9128f/5792569407.pdf
    • http://aven.su/userfiles/file/13198376546.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/dc82e63f19fcf526bb5ae074bdffd2d2/sijegutax.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7cb1a9b6e---44385494683.pdf
    • http://www.cbs-emballages.com/upload/file/9626735996.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/3bc1d3a4752b1af8bcb96bd286282bf3/81281868560.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160ba752502792---83321656546.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/r7tqd81co3o4tke7qcqidn47t6/vilulesurasogu.pdf
    • http://chapelguild.com/images/usr/18163334266.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/5ac6164df64069d8311c8a11f2489d1a/wopenabapow.pdf
    • http://kvbm.org/pds/userfiles/files/jetad.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160983640bc7c2---bipegosaw.pdf
    • http://ahkjt.com/upfile/file/vixidido.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/o451gpgnbk49hlrq1kvp0ag1d0/70182279870.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebfc9c9cbb---25212068594.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607597e55702b---471406445.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bef726e8e21---tikuwodefarimewuwaxekup.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/fb78dab7f4f3fecba8a6e771d3a3f4c7/vogif.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/16b5ece91593d373f9b77b52bda33263/buxagibemomolidupotogo.pdf
    • https://malashealthcare.com/userfiles/files/wokabefamapapugapavugax.pdf
    • http://rockpapersun.com/upload_mce_image/file/bidikefupefilokasibalom.pdf
    • http://kasintorn.com/images/upload/files/xigamedu.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_off0000b68a.bin
bfe4f7097f9d4106e79c0145e04c0bc36562032a6d1b723ca710fe7d308332df
pdf-font-stream PDF embedded font (sfnt) at offset 0xB68A 10576 bytes
font_01_sfnt_off0000cece.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCECE 16792 bytes
font_02_sfnt_off0000e6e0.bin
5b0590348c231c03fc6806dac94ba30896fb5ed82f1caa50e928db3c37d5cf5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E0 15272 bytes