Malicious PDF — malware analysis report

Static analysis result for SHA-256 74e89d77bbb434fd…

MALICIOUS

PDF

93.9 KB Created: 2021-09-21 20:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5e5835652350f5e091ccd2cf4506350a SHA-1: 9e213fd0ad536e2532397a049c9a763011432be7 SHA-256: 74e89d77bbb434fd3104dd86c5c2b985998d5561f82deb727d12bc33b90a2448
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/72690434915.pdf In PDF document text
    • https://nepalfinepashmina.com/userfiles/file/385532581.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/85512702681.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/5319496793.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/lotunopav.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/66026405409.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132de683ec72---20573606828.pdfIn PDF document text
    • https://websbag.com/uploads/files/91764286999.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/ragafaxuposifeke.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/kejudumuwarirevo.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/salegudedomivivotekezobol.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/86550304898.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/35tnb1plk56938n52s7tsco1e0/mezozumusaxupizisabezuba.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/gobigutevewaw.pdfIn PDF document text
    • http://doxity.ro/ckfinder/userfiles/files/53590511130.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/setekupomexemedoleke.pdfIn PDF document text
    • http://leguido.net/files/nurovusa.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/6c99cd6c4a728ffca8819497e27668b1/jagesepivapotuxudi.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/zegisukedoxe.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614294dd129b0---41558814153.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/82235288111.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/nikuxetesav.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/53854112980.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/79340003993.pdfIn PDF document text
    • https://cartolmania.it/file/6393988705.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/85571812972.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/72394829129.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=aplikasi+baca+buku+gratis+untuk+androidPDF 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_off00010c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C91 10872 bytes
SHA-256: b2543c7154f7f35929857305d1ac4dc0c9d12654634d5dba26379a0369a68c13
font_01_sfnt_off00012562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12562 16928 bytes
SHA-256: 6f33c158c4956561e254de92089e367a3cd0184b7c46b416b2a5229a901202e3
font_02_sfnt_off000151a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1