Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eb228f813a8a2c3…

MALICIOUS

PDF

76.0 KB Created: 2021-09-16 23:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d14089891f2b5afcb3ccaff9879ff455 SHA-1: f8b13939248384434566e4df128c8cc0aaa00a2b SHA-256: 1eb228f813a8a2c370ed4b614c9d4be29414e8e9e1f3b7c10e2a1c4fc91e16fd
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure but containing embedded artifacts typical of malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16141fe96e9d3c---14170780265.pdf In PDF document text
    • https://classoft.ro/userfiles/file/46009494528.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/74230646854.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/35446171550.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/82897510926.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/98383300517.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/10107282297.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/71056684755.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/jakosupatusigodujunurow.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/lenafutoxarurikab.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16138303626010---71077189554.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/aa138c41ed5c63af7eda653232d890a9/ropudetinejozarejot.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/82833664492.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/vexaxofefusuvetufiridibex.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/5261224060.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/88132629690.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/luwanejumiru.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/dapogu.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/falutudami.pdfIn PDF document text
    • http://shardamedicalstore.com/singhania/downloads/file/motawapalubinutoxege.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/lupivusiwimi.pdfIn PDF document text
    • http://egitara.com/upfiles/files/pepusina.pdfIn PDF document text
    • http://med-os.com/user_upload/file/ziledurumug.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/woworirovotiwerenokovuka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=euphoria+episode+1+season+1PDF 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_off0000c61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE34 10480 bytes
SHA-256: 4942f150632705a5e6bca43b911e68f40ad97931911bce5411dc27291f1bde51
font_02_sfnt_off0000f5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EE 17200 bytes
SHA-256: bdafd5006b41b639715e9baaad578b75c189a0e02d700471ee0e6e12ef14c67e

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