Malicious PDF — malware analysis report

Static analysis result for SHA-256 58b5014c3ce64045…

MALICIOUS

PDF

76.3 KB Created: 2021-09-11 08:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1fafa136a1cdbe87da6e7a51cc73f49c SHA-1: 405ed21308d07628eeb19cd76c6d80594ab2d607 SHA-256: 58b5014c3ce640459ac7a3bef8b7ee9a00f8f4f9e88b5562eb62cd3d4d17b819
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to potentially compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and a link farm structure indicates an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mamitobe.ru/files/file/29134791766.pdf In PDF document text
    • http://shop-cartuning.pl/userfiles/file/58240116395.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16133374d89351---pivejilewinojitowivin.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/21447092248.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/55374953809.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613340d5686a3---22300141025.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/38109344545.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/dikadorefujur.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/6713688260.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/zeratolapemarunetajurir.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/mikeji.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/fexiwetebemumijozi.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/temifitesipozalegapolate.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/dugilibaxenazisonagibinit.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/c47d07f58e491386f31ac71e01498ea1/japawuz.pdfIn PDF document text
    • https://grancom.by/upload/docs/zoxerinonitonaraxexumab.pdfIn PDF document text
    • http://portableandcool.com/files/files/nalarizibebapovela.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/sosodupekokekudusoroposis.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/47311603263.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/pibebevasozufepul.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/161377046ca63d---88130711172.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/17864571189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=app+store+apk+for+android+free+downloadPDF 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_off0000c521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC521 10648 bytes
SHA-256: f55ad5a5b0e9074e31017f3dadc1d980bcf6f01d198d5fd4a0e836488d329b87
font_01_sfnt_off0000ddba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBA 17532 bytes
SHA-256: e5589af2c7e2155e99c6cbeb983e1bf033dad81307e57335ba260f0f0850c084
font_02_sfnt_off00010b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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