Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ce408613785c45b…

MALICIOUS

PDF

132.9 KB Created: 2021-08-09 17:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: dcd5592969c9d8dce5ea80973883194c SHA-1: accebf871235afd8836af2b79bf3959068506304 SHA-256: 4ce408613785c45b2a8dc596361707aa3acf266a5d990f3dedbc0101de68dc1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, directing users to numerous external URLs, many hosted on compromised CMS uploads. The document body is heavily obfuscated and unreadable, suggesting it is designed to obscure its true purpose of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://lnaixi.com/userfiles/file/20210627074506_1644984352.pdf In PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160933162b12cc---wezefipuvivudikopizosab.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/ac80dcc054d2e696f4a8dd7f896c6258/xuwodufugesexuvemisag.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/novutejul.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081302e309e9---reminof.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210510041524933.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f7d9d2e7d73---7157730245.pdfIn PDF document text
    • http://dejede.com/userfiles/file/fetuwanomasejaf.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/zopafopofaxiluta.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/k89mgfe0u12bio3iav1o11490i/13194608251.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/ff42e12da307ab4b353ba44a523f0a0c/zabinowamav.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/23687595069.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aed5e7e9083---10900605942.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/201825c6a9786d12cec113500b35f443/89900242350.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/75747082840.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/42792470519.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/v8k4vmol1co888lrd1a0t4fq5g/fiwifefeburisow.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/d3a742eb22ef434d4841fffd5a857b5f/34904643019.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/f998ec4883a117569fbea1918a75ad25/gibutulapugoxenufigivo.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/lilegeliwanatipopoli.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/biwamabebavazabarawo.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/e8efed6821684a13fa3ebed8429660c8/68392739089.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=kitchen+gizmo+sous+vide+error+code+ee1PDF 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_off0001a2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2E5 10876 bytes
SHA-256: 36b2e15d22382cd2d97950a48ee54b89ff82a8e9eb89cd03f14a6727c57bb502
font_01_sfnt_off0001bbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBBD 18084 bytes
SHA-256: 5b59c8724fc4f64698bef9fe8dacb1135dce5ea84ee8c3e35314306cd464669c
font_02_sfnt_off0001ebca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EBCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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