Malicious PDF — malware analysis report

Static analysis result for SHA-256 18673c68dc6d9ba3…

MALICIOUS

PDF

77.5 KB Created: 2021-08-11 05:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9eb0033c2013095b5d3bc063556a7aa8 SHA-1: 24e381c66d316bf871b9e28c630eb3a719b198c2 SHA-256: 18673c68dc6d9ba3caba67a9ab3e6e22d319db3932dcff89021f7fa2607ddbde
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs that point to potentially compromised websites hosting other PDF files. Some of these URLs are hosted on disposable domains or compromised CMS upload directories, indicating an attempt to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://olneyjune65.com/clients/d/dc/dcef5d22f85ec69f5810ba62c2e8cf46/File/41689493763.pdf In PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/o65rthro9oqse6bvjbrcma9qv5/fatunawalinivobotaf.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/65345320142.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/mfcmsonu9kr81npb19f2jvacmf/vefurafatep.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ef425a320---zediduduna.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16072d5eebd73d---maridekorasitijavijavoze.pdfIn PDF document text
    • http://kotolantopeni.cz/file/54225573727.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/kuxij.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/57707858624.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbed835e12---duzowozuvetazuvazolemagi.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/97f5da04c1cd9b9b15bff299efee0f1f/16489394354.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/23681585175.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/pagus.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/bejemibokito.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a84459ba4e4---dupovenabapawujavi.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/mofejokevurani.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/8smdcf6t7933iacipk8mhcq9p4/26370258381.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/rofidevubus.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/revox.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/55112a289b3943dc5ed52245c20456a2/85283733871.pdfIn PDF document text
    • https://fallsplat.se/file/tixolaxod.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/zovapufilinofovu.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e867e673d6---tekilivowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=norton+anthology+of+english+literature+10th+edition+ebookPDF 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_off0000c9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F5 16620 bytes
SHA-256: b4493239e20f83f439917f9482f1208fa345ca131f1f8c2fc348940971bf99ce
font_01_sfnt_off0000f51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51B 11232 bytes
SHA-256: 16bdc57cd8b9be7274bc2b680d4c5322ec7f875249ff96a15419cc4f83f1b23d
font_02_sfnt_off00010f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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