Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e840dda8b276747…

MALICIOUS

PDF

161.9 KB Created: 2021-06-18 13:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: b9d7ce26699b53c3746f8c539cd51d81 SHA-1: 45b6e5d117a494bef4ac7054cce6ca4b85455c3b SHA-256: 8e840dda8b276747da5b19a4d49f08c148782f9d29bab76b4c7bf76825a87d48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad7d40b669---54717895768.pdf In PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed5dd33ecf---lusepajamumosowolilenuxog.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16080856038c77---tubogusobawavazi.pdfIn PDF document text
    • http://canvangdientu.com/images/file/tesudeniketiwi.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/dudud.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/sijatiwelozivevis.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/49379213299.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/sdusscu6lsk7a2g54b0jdpvp1n/kasewomali.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c010855fdbd---83298919202.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/18221661917.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bd5c5318d---bazizagusidaxuw.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a70de4c69---62206560678.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4e91b5e11---gezekavanodofizi.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/ac0bf6157916c097e3d8d7c82586eeaf/63784103497.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/235bff434b81835950c746c801197c4a/viboserosigufobat.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/tisuxaferil.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c965d8ddd5---gunavogawe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=sword+art+online+alicization+war+of+underworld+part+2+watch+onlinePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6A4 44792 bytes
SHA-256: e0ec28bfb53d6c61c62849f71495898a63dea1d463b3ff8ee9cb81d6487eb254
font_01_sfnt_off00023fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23FA4 5440 bytes
SHA-256: 42f9cfe45e470985200f00302d38bd9fede9a8420fc617d6ff53d0149ca6e568
font_02_sfnt_off00025240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25240 11952 bytes
SHA-256: ebce35d15a2cef199da151def8f03a601fb3f91df5a6d8d87ce2af50ba0802d9