Malicious PDF — malware analysis report

Static analysis result for SHA-256 f129837b96b6003e…

MALICIOUS

PDF

87.4 KB Created: 2021-08-09 18:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 96f5d6ee3baf46046fb074ca81324820 SHA-1: 4c7b83c4490ad4d9ef07bd7a7be6f69572313daa SHA-256: f129837b96b6003ecd9e4f80981c1981786f56f7b07b80558ae01125f616e7dc
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Security Software Tampering

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains heuristics suggesting it's a link farm pointing to compromised WordPress uploads and other disposable hosting, likely serving as a lure for password-protected archives. It also contains instructions to disable security software, a common tactic to bypass defenses before executing a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b451cb9d1f3---tijisuvapopasopugot.pdf In PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/90787576287.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/63088222577.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/76247901181.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee0c016053---vekuzigofo.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/pobogamaratakezidozib.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8a43a8df7---69308467056.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071830b30b8f---xuguvugetibakorokifove.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/gezopikufu.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/28201444614.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/2phc4fqh18nhjuo6uc1o0cm6b5/70178364526.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/5224711263.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/jodaku.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///domudedelifisolilosa.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/mudawinibi.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/9ab32662fa34ab4a16e8d3cf49a7318a/37676962518.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/federewagirisivuxo.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/wajon.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2dbb3ed33f---xudemedaju.pdfIn PDF document text
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/98082376318.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/wirakasatujigaguwumuviz.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2379447ab1---bizosemoleso.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f655bb89e3---41482459360.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b432b7457f3---napikekoxiwawegiwujori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=idm+full+crack+li+indirPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72A 10264 bytes
SHA-256: 4efff9b257d4dfcef9fd7bb71fd5fa3ee354ceb175ec6ac6cdf6d19723c0b8b3
font_01_sfnt_off0000ee16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE16 17480 bytes
SHA-256: 10bc930a142709cc84299dabde96fadd6df9330d88b22df117e2413de8717104
font_02_sfnt_off00011c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C07 16916 bytes
SHA-256: 8a98b792d764ac20d9aa38da351367df8fb7eaad5f6f4f84f7cd286ea268246b
font_03_sfnt_off0001345e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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