Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c12b972f46a06f4…

MALICIOUS

PDF

74.3 KB Created: 2021-09-03 04:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9aae6cff58c2deda65480dce42b78d94 SHA-1: d151448000babb4e8437ee81c40af65e524cadf8 SHA-256: 8c12b972f46a06f46b5a9948b6a26d6096fa1c845114cebf5aa3450a685f2d7a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting it's used to redirect users to malicious sites. The presence of multiple unknown URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f93b0c9b0b---xetixupa.pdf In PDF document text
    • http://bnblspecialities.com/userfiles/files/numafaxokumijaxo.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/bb623ae708c97c4146e0ee9d97782f38/sonojeweter.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/24470578953.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/silekukoladugusajulo.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/28134647035.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/tusuxojax.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/75898952044.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/49705852643.pdfIn PDF document text
    • http://deficanderel.org/clients/6/67/674a09facce11b7629d390eef9534ff9/File/binimitoberizopa.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/faxidigogajogafa.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/sesokoge.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc444d7f787---kuxewidoxalosenabajijipep.pdfIn PDF document text
    • http://sinostandards.net/upload/files/77904613270.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/1c7e01e194aaf40c8c4d5650f0d53632/bimogiv.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fed39ac05---2852081188.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/10debd7650c223c58ed1f4760a7b6115/pasuzedinezuwalokozojawo.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/69421107318.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/50971502818.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e89013c135---zejoninopusel.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607776f6a47c7---54525476295.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/83448672181.pdfIn PDF document text
    • https://webmenuplus.com/images/file/29373131791.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/zimoguw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=fool+for+you+piano+sheet+music+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_off0000be08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE08 11076 bytes
SHA-256: 13a66351ed7ed449ab3a8bc9162cdd682fdf1cd642c925ae60971c9f4c5d43c1
font_01_sfnt_off0000d7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 17160 bytes
SHA-256: d2eaf61b7fc29b4d9d0a2d919d1f196af4b7dc78305b950deb0f357002133cf2

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