Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb16aa11af955653…

MALICIOUS

PDF

74.9 KB Created: 2021-09-02 23:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c33523d57f8db71418ef0fc2c176b358 SHA-1: 6a46a80bf69a3f6711d9952d795cdd9faba7eae2 SHA-256: cb16aa11af955653d0efdc71d873c0af062ae3e090a6e0de1db4fe86b5acf1c5
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 as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to numerous compromised WordPress upload directories, suggesting an attempt to host and distribute malicious PDFs. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://tigaintan.com/contents//files/66665827285.pdf In PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4b66f918---82885811484.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1608820fdea98d---343423346.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edf71fcf8fe---torozepefibiri.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/mipasuke.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d8616addea6---14548050340.pdfIn PDF document text
    • http://evola.it/userfiles/files/sujato.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/d07b6d200f26e85c9e6bc7eee1fd67f9/39021914571.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/nazomatakiwa.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/0c3254fe5ee91623dd1970f2f2ed3e7a/56428471424.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/pidemadojopasurimi.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/89509250453.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/77846075965.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7078b96ef---3414217937.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/36880704109.pdfIn PDF document text
    • https://asken.as/bilder/file/84649761202.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16079626d8cd2e---xofizanepegogeforosopusus.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d7f5f3771---morobol.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/a576331b0822edaa6d7dd0a8822a2847/lalokapuverevu.pdfIn PDF document text
    • https://ismart99.net/upload/files/fimiguwufebetozutozure.pdfIn PDF document text
    • http://chinazzjx.com/d/files/26261689858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=piano+music+for+beginners+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_off0000c360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC360 11060 bytes
SHA-256: 7c711110629c87f224d0b00df436d12ca59027a348d9eda41977ddf6d2c44a27
font_01_sfnt_off0000dcb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C3 16208 bytes
SHA-256: fec73439a9dc8cd942986dec868f069a2b19ee9b8a7ad97926b7186214898a30

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