Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fd803e3acf0b897…

MALICIOUS

PDF

80.4 KB Created: 2021-09-04 14:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d3a914ee4d47e08742e87d55581d62b5 SHA-1: b5b707f6e2e69813cdbcbc25001585fb6332bb74 SHA-256: 0fd803e3acf0b8970885dab86791ad63878c5ba931b8bd83930b579a867dcfda
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, directing users to multiple compromised or unknown websites, including one hosted on a compromised CMS upload storage. The PDF likely serves as a lure, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://samuiluxurytravel.com/Uploads/file/84185973936.pdf In PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076ff7d04c19---95552164555.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/voraxukab.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/21463864491.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607581c3ca97a---lobavoxudigaduxisa.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18882a9f4---56596256599.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/samominominew.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/37813975994.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d631b48df8---jovekosusatamad.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/84720615222.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086fe10d68a8---77769237392.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210614164423.pdfIn PDF document text
    • http://email-database.info/userfiles/file/39547708039.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/ttd0rppoe2cef3nk6t8hd2kbv8/253246331.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/varivawabopusulelasen.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160afc789c026e---rubogupev.pdfIn PDF document text
    • http://fittbikese.hu/files/file/67259177130.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608beda0c50f4---44848783959.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/db92e539576ac2f55777666afda9b374/57196891836.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/vakenejolato.pdfIn PDF document text
    • http://englishplanet.info/ckfinder/userfiles/files/dogipuravig.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16083ca5936139---12782521556.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/vezowowowamakigatiki.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/bujidolekopenifozozozawoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ericsson+mobility+report+november+2017+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_off0000d3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CE 11264 bytes
SHA-256: 14461b12093ddd2e6d66e12d4a88722caa6f12dbe82595e4a59a6d6d94f3aa21
font_01_sfnt_off0000ee22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE22 17888 bytes
SHA-256: a84731cd6bdf10a021576e30c7a77652e5f646dead51056906ffa5f6895d8922
font_02_sfnt_off00011c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1