Malicious PDF — malware analysis report

Static analysis result for SHA-256 0835fc17f5723860…

MALICIOUS

PDF

80.4 KB Created: 2021-09-10 19:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a4e0fe74dac2976944eb09333531651a SHA-1: a555bef4592911ece2b0518fd73619eb08434c9a SHA-256: 0835fc17f5723860f0681265256b1adff3612668710ee78f81d0b668f52304c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage or appear to be disposable. The primary function appears to be directing users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/63753950014.pdf In PDF document text
    • https://mimpishiodua.com/contents/files/87081896261.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9520158df---13874677918.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/65647936553.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/64209177893.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/togakuzomex.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/5800394895.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/46205389952.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/fulewesirazolatajanuro.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/gegimewerexoraro.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/87334952791.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139357c179e9---92232840919.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/mogomemadawufomexapiz.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/11288366066.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/vimonaruzuwef.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae49010669---20442609962.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/fabebatokuxutoletonusomi.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/80453458899.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/jofutunuzegadupazuzebajuk.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/gowexupozukofejaninez.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/27416540543.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/31412840377.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/92537690870.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/17254797966.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210909072857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=smartphone+wallpaper+hd+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_off0000d647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD647 10556 bytes
SHA-256: 865008dcbe0f9590b31c387cc00dc6a495e0d54918c37faef3713deb1758bdbe
font_01_sfnt_off0000ee30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE30 17600 bytes
SHA-256: c1c4f421dc719e29677c172147192b75cf741e9079514549e328d5d4a9f5450c
font_02_sfnt_off00011c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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