Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9634543c46d4c5e…

MALICIOUS

PDF

78.7 KB Created: 2021-09-03 06:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 05774477fe17b6761e10807942f5e938 SHA-1: 81fc9dc485b0887ae6a910be99a8060008f07901 SHA-256: b9634543c46d4c5e1e289d963b4b26791cc0747858817b367ce52bc3fa82005e
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 it is a phishing or malware distribution lure. It contains a large number of links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the nature of the links indicate an attempt to exploit users through a phishing or download scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://akkoryazilim.com/userfiles/file/44844122704.pdf In PDF document text
    • https://searchlink.org/userfiles//file/23165958890.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/zuzuzuvemozavesa.pdfIn PDF document text
    • http://upbfassadenbau.com/upload/file/pigudato.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/ho1fqvri5jiiraqgscoma4a642/97386681748.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/novubezowowiwotadako.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/45886190602.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc5aaa9b1e---kedofelu.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e9e69c866c2ae25cd0599f128ba6c692/95945834777.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/53759923398.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16090e20be1c75---digesubinolisa.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/9f47dc968da474c97c83b2064d41e028/55166669603.pdfIn PDF document text
    • https://securitydm.com/slicice/file/zasulepo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098351ee78a1---59356179118.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/42ad9e8fb9e1bff4c9d489263bab01c6/18418000189.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/6ef8c1fe7d84c35c6a50a0af55a7e795/wamafimomepo.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/84888012127.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/semulew.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/nosusasefuz.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161302c7001e1b---wizekajikebewugojon.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/39513040664.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=las+recetas+dela+dieta+del+metabolismo+acelerado+pdfPDF 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_off0000cbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFF 10772 bytes
SHA-256: 768c1ca39669f88c899126a85e0487cea27ef23eee1ce7edb587bde4fac25562
font_01_sfnt_off0000e48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA0 19008 bytes
SHA-256: c8bc1e179a38417e18745696d0593c5785b96eff01447202b3f1a810bee40a4d

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