Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4c32a691acedf3…

MALICIOUS

PDF

93.0 KB Created: 2021-08-12 00:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1cfd3cce77d870db4fb6b1c148460097 SHA-1: abcb3e19de3c5be34df0384ff6279912409772e1 SHA-256: fc4c32a691acedf354e99baf3c47eaef588dabbdf4b9a6a93a3d19ec3211c555
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://cructi.ru/uplcv?utm_term=twilight+movie+watch+online+free+in+hindi PDF link annotation
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/bf123bedd57078ebab79b0b22c7fd85d/30189597768.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/gp8f0kc8kusiqelg6um24bisqd/20883994391.pdfIn PDF document text
    • https://aedwea.com/upload/foto/66222628728.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/45667584725.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/domutato.pdfIn PDF document text
    • http://rayanchem.com/d/files/52675876099.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/zasoluxefa.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/31330958164.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210505102823.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/lewixamedexoj.pdfIn PDF document text
    • http://brownmahonefamilyreunion2015.com/clients/7/71/71b8b7811cafefaf2288418346dc0658/File/71534017112.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4692c3767---88785511868.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/6388360912.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/bonilesoniwo.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/6d5ed24cf4d06fd045b7f457e181583f/negosolosizuvilumofik.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7419e9c65---1346096020.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c16d5e86d---32954130691.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/fijazozetugekelizop.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ab35c32c5d3---39632423090.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/a39361391f6a8c6c3a561407b1e606df/53470819594.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d46b733a28---vutiwizevilova.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/neghr95emrivjf3s7grqr1qbjo/96388016727.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/23971561920.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe820d2c89---molabisilejefi.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/2qne585cbuj03en9a87c34r9ps/32255355730.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/kepubetaxatajenot.pdfIn PDF document text
    • http://aps-mes.com/files/file/budewedezelilanasepineme.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_off000106a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB7 16932 bytes
SHA-256: 9317007d950ec30adea1bf5f84ae3dc65a8cbc09a0eb3667128a05c5c4926338
font_02_sfnt_off00014aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AAF 10868 bytes
SHA-256: e5c755a49823a8784e1ddd9a6456df0942962ceb9f65a74cbb8c75d689ae3f43