Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce4bbc6ea495bbec…

MALICIOUS

PDF

94.0 KB Created: 2021-09-05 06:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f8cdd81e25a6f7187d0b6c9e53c9c289 SHA-1: 39fc2c5a5b684513bc426b0c79179be531c1d189 SHA-256: ce4bbc6ea495bbeca9b9e0a90ba57f49ff6eba9a6bfa7c57389fae1ac35c7a08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to websites, many of which appear to be hosted on compromised CMS platforms. The primary purpose seems to be redirecting users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/tfalkb4v62netekgahd7ddsfb7/kerudamixafotomo.pdf In PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/i84e0m423t8bpju649dchn0543/rotavezufezidujuteme.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/12451932076.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/gumobojasosidibizojezete.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/8842036227.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/75862044524.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/970aa2bacc7a5aca5308168709e12050/35403783767.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/xaduxoganezenizuxukagufab.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/jubede.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/82017562914.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b01a9db6fc7---litamibixovesubowikun.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/susofisel.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/wazuvifokegosobuga.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/xeruwemesikifon.pdfIn PDF document text
    • http://cochu.net/resimler/files/22465389439.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/d1f492fc44109737b5ef94ad0efff06a/bamurikixupebedimul.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160aa256a079c1---7532838414.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/97203968941.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/wakulizokapokam.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1205d7fc0e---sirusulipibidipajaku.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/80533166090.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/poxakuli.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/xebatemudalawegenawuf.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4a959a66f---jivikewilusolofanogak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=anatomie+de+la+main+pdfPDF 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_off000108d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D9 20268 bytes
SHA-256: e57074cc652a95e702de9b653745347d9a33760e15eae88826b9f8153ab2a0fb
font_01_sfnt_off00013b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15355 10372 bytes
SHA-256: 767e6717d6a4f468333ee4f5bcb6fa15f0eba624ed8b719a67824d357ae2deee

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