Malicious PDF — malware analysis report

Static analysis result for SHA-256 916c06a23bcf9497…

MALICIOUS

PDF

79.9 KB Created: 2021-09-04 22:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e832d2fbae145b53fcee211c432c87ee SHA-1: 4a01bd131b5a336db4612165215678a5daf6f79d SHA-256: 916c06a23bcf949718d1192eb760f181fa6219649cbad27fa99b99d97091d48e
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, containing numerous URLs pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The primary purpose appears to be redirecting users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zuche0551.com/upload/file/85631309135.pdf In PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c397cbd54---xugemizaxet.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/rukovuduroki.pdfIn PDF document text
    • https://adikkedua.com/contents//files/pezorilobopezori.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/xewiwurilar.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/bixonud.pdfIn PDF document text
    • https://huanghecables.com/d/files/37742306144.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccb3b7b4b1---dedaradebiz.pdfIn PDF document text
    • https://belhasasecurity.com/userfiles/file/26046121235.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/jikudomesaloronufixuzo.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/zaniw.pdfIn PDF document text
    • https://belhasasecurity.com/userfiles/file/damigegobowosorisafij.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab661032afe---5200400264.pdfIn PDF document text
    • http://tochalco.com/uploads/files/rugiwekukenewobunomajog.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/89ff5716df0ac0ac4b47cfdac056234d/piwididogitivo.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/28673056639.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160953325e1aa5---kubavajotofojebuviw.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/d655442403877b74c2cc509dd2f92419/xamewofilitad.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/tr4i7i92udchslq30nkn39phl0/54093400217.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/xuvapiliwejavara.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/418f9b0005490b8ee9fd1b3bec95903c/tilek.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/ropifixijevelaxazipirew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=direct+and+indirect+speech+rules+chart+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_off0000d41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2C 17840 bytes
SHA-256: f0168b81b2359ad69f17b315bdb9caaf021097192dfba2f15472a9b8d3b52b98
font_02_sfnt_off0001193f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193F 10696 bytes
SHA-256: e11c8cd844c998d8812f509942899c8583a24fef50d599bf333b2c102d8fe7f5

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