Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2e20c95d3712a33…

MALICIOUS

PDF

88.0 KB Created: 2021-07-18 17:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0fc2c6eeb527aca9ff92cfc11c18feae SHA-1: dafb9d0e81f5105aa8b288cb579418b3cf6d698b SHA-256: d2e20c95d3712a339007b36a3044b1b5c93953f0d0a95193794c345fbe237dc6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of multiple external URIs and link farms suggests an attempt to obscure the final destination and leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d4048969427---jopumuzexupuvaxinil.pdf In PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/8hdqio31iorm2o902a4i3h5uoa/9117864947.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/kilawivepamasapil.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ae017d2f3---gezerepiwomivosazub.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/labebakupidorotorinusup.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd90f3430a5---xovemukatixo.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/7483442175.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160df9a264c6af---suladuda.pdfIn PDF document text
    • http://rococosofa.com/files/files/karugolazakewovulutidid.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/55041158195.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1bof83vifdgorc92h2qadv1f70/19959152790.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/f7ec720b1ef13d88e4cf9187f756fa05/5440114454.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab39f675e3b---linezeziwuwimomagowu.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160afa703a02e8---45949637311.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/28478047158.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/bigejixajadubejevogubad.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/27172597218.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/kevudasimudatetisi.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160718ad1e83e4---jolixenexev.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/3da6f52400980711baa0fa57783fcfa2/vomurakususudeliselulaken.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/noradalogukaso.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/wajebolawanuseboxiginodel.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/54d90c38dd2bdb4996ed083e14654390/fogozarulidofegomume.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/seragumiruzagagow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=red+streaks+on+facePDF 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_off0000f831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF831 10468 bytes
SHA-256: 08436eb0ea8bee02a1cd8b049080920d6edec45ded2819ed475359957705bed9
font_01_sfnt_off0001102a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001283c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283C 16328 bytes
SHA-256: ca3e53c8eb468551fe6d280433a64050bf320465a5d35974b79cb2fab937a643