Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e319713defa1f5…

MALICIOUS

PDF

73.3 KB Created: 2021-09-02 00:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0f165a473abdbeafa134a7d71405b8c5 SHA-1: d348446542769c58caa2b36d4e9377bc5129c857 SHA-256: 76e319713defa1f52d6a0a0ba48caf333851ee8dbf89d70897114532dc945edd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress upload directories and other disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f48ba43e9---85458740508.pdf In PDF document text
    • https://olterus.org/contents//files/gedubuzaxokebemulagex.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/detopawufotipar.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c79c16910a---vasusosixukozasifibes.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/lamapesejusewaliv.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/12927834332.pdfIn PDF document text
    • http://elskenecologie.nl/files/pinekafesiruxezovijeduz.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160be87f9ce2e4---begibipebav.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/19390177785.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/burapewoxupibu.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606ced8f04e3a---58253547226.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac1db15459---refurorikunizavezi.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/540eb5bbfbcbe2884c4c1b537dc096de/9945582583.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/6c8bdf045111da98d28d462feea6d010/jefibofowipogafiluma.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/10120355986.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f8621c2a7---podebosenironuzowegu.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/xogigewuwoxewen.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1611aecdc99f15---manigu.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/mdmcqjto30v47cp9onbu4ijms9/60388788285.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e00b63d32a0---55860328322.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607befd0e7626---62491893720.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/84224653605.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=write+each+polynomial+in+standard+form+calculatorPDF 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_off0000ba32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA32 11092 bytes
SHA-256: 5f2846b3be0be2e30e098420fd060be2d46e6e23c807ffc59b80265b7ae063bf
font_01_sfnt_off0000d3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E3 16064 bytes
SHA-256: edf67434a1123fde756b35bb28f3e022b9f28d288dc5e76c0a3563730cb53ca5
font_02_sfnt_off0000fce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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