Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e413e8e925de6b…

MALICIOUS

PDF

72.3 KB Created: 2021-09-25 17:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2f6e93df4cabd6e42674a3006fc684d6 SHA-1: ede5e94de1db432b4588689e51b8108362dc6aa3 SHA-256: 86e413e8e925de6b12850b175024d426c5f41f84aa38bbd439ee2e7c6bed5d9c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://costruzionibulagna.it/userfiles/files/livumopibubageji.pdf In PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429b8763e20---18810571601.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137dee7da27c---vagit.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/72324504992.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/82515170843.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/temuxov.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/39850655177.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/befepolikevet.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/482b7f55baf376985f33ed916f674358/31569995568.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/98921621377.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/xosusiwejezov.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/79417326138.pdfIn PDF document text
    • https://robertbah.si/files/file/pajokesani.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16149635d8efd1---zaral.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/24872411467.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147628063c7e---kavuwupi.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/70014693073.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/ruzexogazefeduwebubazov.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/sedemofugira.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/vumowuzovotozirusunezali.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/5263866032.pdfIn PDF document text
    • http://kccmaul.com/files/files/37868729234.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/65981640058.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/72562333615.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/tukowuwumufonabem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=michelle+alexander+new+jim+crow+pdfPDF 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_off0000b7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCA 10928 bytes
SHA-256: cb755352fc9a93dbe008e1af0c4dfbc2eada857787967779be0c2472bc171855
font_02_sfnt_off0000e8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E4 16600 bytes
SHA-256: 962472f8779be09f50d60da0a9ddb3859a279df1cb5adf5c5ff43c9e1ee4f3e8

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