Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eec9f4a24a6e3f1…

MALICIOUS

PDF

83.6 KB Created: 2021-09-01 13:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c12d09100e6fbb435b2ee436205f3825 SHA-1: 083611998da0f4a2f928a40832ca2f3b9927cb5e SHA-256: 8eec9f4a24a6e3f1d36a901a02b3dd98197167a0041c41ba1dfbc469b6577c4a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, but the structure and URL analysis are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://abugfreemind.com/userfiles/file/jetipolifilaweruborufi.pdf In PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160dbabcea4e94---venejakixovetew.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/xexemijeg.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/70026639371.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/domuwezaxezufakuzazeg.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/fuluwapunalil.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/11672628965.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/kaxisusopuvujitatulig.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/zimodovedolubaw.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/23694927165.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/4e010916033b9e8bb670cf9fedb8e97a/dafir.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/82986815618.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b36a6a86---laxalomipukibidono.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/2d2aa87b83e15911a6c2f5e71b388f03/zenitaremolapodepew.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/21419928896.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/rumipokezo.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/0cca1394b3eb1d10509194300208440b/vumojole.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/98682327233.pdfIn PDF document text
    • https://verner.lt/images/files/83925879003.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b572c11ee81---vesafazogililesugu.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/1c2f73d37ff61e7838cdf7ed9759155d/64893503912.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/trn58ttss7fcchbcdirmg2l1gn/67416851424.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/29450455377.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d266c2a243---92787218503.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=paradise+lost+book+4+line+by+line+explanationPDF 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_off0000e44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44F 17004 bytes
SHA-256: f9090bc45d52c5fe2652412b043e253858dd1ad9ed8b5890c1c5c4ba09d463e4
font_01_sfnt_off00010f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12739 10912 bytes
SHA-256: 2e97dfe7c7e5b3240fe0db2f8c5c6df375b5d262dc64c15062ade5090b17cd22

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