Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2973e734961e13a…

MALICIOUS

PDF

74.5 KB Created: 2021-09-05 00:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fb6646cef527ba346b764e2169b9e229 SHA-1: e2f4ba4641242a6d485077bc3a50987b15d61493 SHA-256: a2973e734961e13a9f8de1ed9453162b55953849927c22c3ba749c04997cee9c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting sites, likely intended to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/26510406262.pdf In PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/puxuv.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/5af1fb1e204e248d00f0d21734584be7/85747848554.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9244e6d99a---romusikir.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/51104618091.pdfIn PDF document text
    • http://faradbox.pl/files/file/nutotijezude.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f368070f1---50849065962.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/borege.pdfIn PDF document text
    • https://efnnma.org/files/file/bovanirobagigebumidituze.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dupepasotu.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50172992969.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/wigow.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/22049130897.pdfIn PDF document text
    • http://haai.org/upload/file/nanosofobovojipumagin.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160f54e155eac0---zasokitudozexinuvedodiso.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8bdd8fb71---80008860024.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/zisomozomorabolugugefigoz.pdfIn PDF document text
    • https://cncunse.com/d/files/dadikanolegegus.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/nawikow.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f639834f75---63309265724.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/53259285674.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/615472f9447b2cdad93724efd91cdab3/leravotubomakedetapexepov.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/zubotepefonexazineg.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16083b24bb6813---gasino.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27da31e42f---33807277433.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=poulan+pp4218a+owners+manualPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC164 16000 bytes
SHA-256: 8e623994a278e81e10cc51e28ac947f7fc670287ed515603cf8b2008d59aeaab
font_01_sfnt_off0000eaab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C2 10868 bytes
SHA-256: 75649690c690c88da35de3d1f0ca18d65a941eefa11b0e0d96e2e48bfe741f42

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