Malicious PDF — malware analysis report

Static analysis result for SHA-256 d78ac8388d1ef595…

MALICIOUS

PDF

82.7 KB Created: 2021-09-03 22:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bdd69fc6dba9ccdcab181a09b2e2bbf4 SHA-1: 7a343e1cbe3574978c6f6fb0cddde44fcde0f9a1 SHA-256: d78ac8388d1ef595e24a21d1a8bc5ba7e04b8d9d12159ef35cec59aabf112afd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6853b38d6---41288819656.pdf In PDF document text
    • http://kayapaliinsaat.net/file/99102410163.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608947b07cf56---50697551892.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/sawaforovegunejanavus.pdfIn PDF document text
    • http://c-amc.com/upload/files/lavimajetitoja.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/l6a78v8rb19f5dlm1jkfto8eab/rudapamazakur.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/xutizazejerutogiw.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/zotix.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/jcrfm2l76ob24b3ngjhoje3d63/rubesezefobumufap.pdfIn PDF document text
    • http://policylic.com/uploads/files/xetifegejejis.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/d8080751f8f405a01e40a28b73665985/67358282274.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/60082172832.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/86867697635.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a00defbdd42---gidiverumog.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/90371957075.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/137c370136031e6b1f2552cc14b3f845/zudumapisutak.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/bidomalumotajal.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/55511760047.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/74825808594.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/wudabesibojefesugaso.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7c0317e32---zadavewojasi.pdfIn PDF document text
    • http://championsview.net/userimages/87996209628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=google+un+medico+virtual+no+aconsejable+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_off0000dbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40E 18532 bytes
SHA-256: b3b499d77e3911e3819074848b81f3a862cb8dcc7284cf8f336ae5d54948c6c1
font_02_sfnt_off000122ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BA 11440 bytes
SHA-256: 5ce3cdc8cad8c8b22d0d870c587bff6dbc531f9d841bac845c465f6960ed90cd

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