Malicious PDF — malware analysis report

Static analysis result for SHA-256 d80a97a7bacf6985…

MALICIOUS

PDF

79.6 KB Created: 2021-08-31 22:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c7f90f8ff7ddd70fa2369bf1607e7b0b SHA-1: 172f9ecf025184c16f939a60ec5f4ef712efa605 SHA-256: d80a97a7bacf6985062d92f3685c5220b9713db65639bbb32af379a55e38ba36
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of external URIs and link farms points towards an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://inwebjor.ru/uplcv?utm_term=add+and+subtract+mixed+numbers+with+unlike+denominators PDF link annotation
    • http://sanmargholidays.com/ckfinder/userfiles/files/nuwuxe.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080007f63935---xiwabowir.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16099c950a4300---17268934165.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52be418b6---lazisuvenuki.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/43994274145.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870e344eec1---21047128884.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/94513819369.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/90976396559.pdfIn PDF document text
    • http://www.yt333.com/userfiles/20210724/file/1627069727.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a14c3c8b79b---kamamipuk.pdfIn PDF document text
    • https://meccanicagambirasio.it/file/zirevase.pdfIn PDF document text
    • http://freewest.at/bofaxid.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/70955130643.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/61773905900.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/tuvapufufotone.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b045024750f---tosovazetisomadopovebisex.pdfIn PDF document text
    • http://sansboundaries.com/clients/f/fd/fde0d4b6b324343791c5f0705b221951/File/77210723065.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/tebifa.pdfIn PDF document text
    • http://belst.by/upload/file/41943113844.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/17f4bcbbf42bc251cf3b1ba08e5bc044/23612461963.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/31773280262.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/17440937730.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/budab.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5248157cf---90920560775.pdfIn PDF document text
    • 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_off0000cde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F5 18808 bytes
SHA-256: 9125ce1ac8e58955629bea78fbf83c7cc543bc882ed0352419721d63897b3c20
font_02_sfnt_off000116ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EF 11136 bytes
SHA-256: 88b3247c4029ea66c5856513bfee8b87cc4e4a6a1c8136fe6e8f141867500937

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