Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d043825981e9c4…

MALICIOUS

PDF

87.0 KB Created: 2021-07-07 23:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5ed89947c4e228b2a23012581fa70b4a SHA-1: 4673b90f87553245f0b12e5e567330f8f5a45963 SHA-256: 84d043825981e9c493e5f1909829c358eae0731558bc92dde07e65d796a2cd31
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 functions as a link farm, containing numerous URLs pointing to various websites, many of which appear to be compromised WordPress installations. The primary purpose seems to be redirecting users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://app8itebarandgrill.com/admin/images/file/18656354587.pdf In PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/veninenojavozuxelawiso.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609038c1e637e---fokawafafamikusaxesos.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/k8om5inrfhf130nvfam5u0fc52/maviti.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/a845929e510efcc6a6f948da4e1df603/9542945471.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/4818250946.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/liel8p4ql8s01vm3krg16dartp/15495527298.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083925a64566---96689018095.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/itkhdgpg5ldr28r8v5ttnnq9s0/63417645212.pdfIn PDF document text
    • http://beiks.info/public/file/44867308620.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/m5gpklm6rnt8468t5pm7no6ab6/xawanevagitigutak.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b940fce6968---2331546929.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/96473064487.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/jezugokaxomikogomorip.pdfIn PDF document text
    • http://attlas.center/userfiles/file/94467387436.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec206440bc---purixavugekof.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/6420f779a378e01b5897735c1cae3a7e/10193115703.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/babiraboruxuwilur.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/dt3ge2sjilmu8a1jj510mke982/73123070670.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/vt2q9buhhgo3cbn12mtemg33q4/66831266115.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f5cae3e2e---94686554432.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f60ab06e9---30477826882.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/89472086776.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=vehicle+electrical+systemPDF 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_off0000f316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF316 10356 bytes
SHA-256: 3dbfa6d02e68c79def6d6f90c0c9b7698b3b6c056e0f6ed5deb29fb0bfcba00c
font_01_sfnt_off00010a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A85 17084 bytes
SHA-256: f89bb8f349c2e52a635dbe1e70ad7fd756ec8dc880bd0801bcf0fe888064ee45
font_02_sfnt_off00013709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13709 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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