Malicious PDF — malware analysis report

Static analysis result for SHA-256 cace7ef333d2c2b0…

MALICIOUS

PDF

71.0 KB Created: 2021-09-19 19:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f6c8ebaa0348683b5ef04cb2306d0411 SHA-1: 40454f0e742ddaa045252e4d19b14a3096d3825b SHA-256: cace7ef333d2c2b0fde4501e5e79b1986f240f4669b213a978c58540d2b15b21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://chcial.ru/uplcv?utm_term=gta+v5+apk+obb+download PDF link annotation
    • http://harckocsik.hu/userfiles/file/wimowenaxuziva.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/2070875401.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/45394780229.pdfIn PDF document text
    • http://basar-hemeringen.de/ablage/userfiles/files/284235119.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96331540025.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/tuvegefabanuvalunojimol.pdfIn PDF document text
    • https://kimcert.com/E/file/lududiz.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/voxawufonozuveb.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/95106060308.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/dilaxewawazarexibibozuwe.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/71634933253.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/75716026644.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16142877639b1f---sawig.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/37442747930.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161428b051a9a9---14446201428.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/seresoluwik.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/46514583668.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/tizidu.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/tuwap.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/58482706147.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-6/20210906094355234708.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143254f7caef---fadigotojifamopisulag.pdfIn PDF document text
    • https://lecachet.fr/docs/files/magapaxe.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_off0000b727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB727 15456 bytes
SHA-256: b1d436be79531033ad0826059e86f7cb516ea36b2075d2fd55e66c27fed2742b
font_01_sfnt_off0000decc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECC 10448 bytes
SHA-256: edf3f498d6e6ecd4bb97eec80eb40b8d089c0a2616b2f9a9fa67ee5792a180bc
font_02_sfnt_off0000f689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF689 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1