Malicious PDF — malware analysis report

Static analysis result for SHA-256 956b7a9049667f62…

MALICIOUS

PDF

89.2 KB Created: 2021-08-05 02:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8773a217944a8a85edbb2afe6a0027a6 SHA-1: b3a3c8cd046850f9210901ce7861dcfc2b06d4b2 SHA-256: 956b7a9049667f62e1862250757b253f1a3a5cea7b6bbd0d350a3f16fac75533
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to external sites, many of which are hosted on compromised CMS platforms or disposable domains. This suggests the PDF is used to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://chromowane.com/userfiles/file/31298238548.pdf In PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/e16ca5fac4ee6de44a5ba3f6cb7af1f9/nujegusi.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/vomag.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55241162650.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a96c1b43d---fekalubutesamagutasi.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073039ccf650---51217615567.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/gakowupurusuk.pdfIn PDF document text
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/wirozevitab.pdfIn PDF document text
    • http://satthachkhe.vn/image/file/46645520883.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/48260918194.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/49862020739.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/84283232575.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c628cc71a9a---famalojowofopakiverov.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/16273153754.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/31142014002.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/muriketiritovafejimofiwox.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/005ca64737cb30d8f152758ecd004a0c/35300513873.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/88091dbb271736ca5c7ff34687100f23/684166962.pdfIn PDF document text
    • http://gptools.net/userfiles/file/69236674497.pdfIn PDF document text
    • https://mashura.co/userfiles/files/xifutoviba.pdfIn PDF document text
    • http://susanirvine.com/clients/82887/File/38849505664.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/2f7048fd58680cbb475e2c38260356fa/48215296982.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=ver+fotos+de+los+chicharrines+sin+maquillajePDF 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_off0000f498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF498 18404 bytes
SHA-256: a86619b60ec2f8058ae687453a35b92574f0363af54e635ab6f76b9c7c9c5d1c
font_01_sfnt_off00012394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12394 11088 bytes
SHA-256: 829714f3dc519b078d477cab8e63ed03cbb5989c58cfd8fcb6634d6a8527007e
font_02_sfnt_off00013cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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