Malicious PDF — malware analysis report

Static analysis result for SHA-256 db334a7dc7142fb5…

MALICIOUS

PDF

80.1 KB Created: 2021-09-21 06:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 193cde5a5510ec703085b94562f888b5 SHA-1: b4694eebb0751e6257d0e988af3a38e8c904fd4d SHA-256: db334a7dc7142fb52eb68eba96daff40fc751e1e0ef43c415b468d8d6b408586
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and the nature of the link farm heuristics strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/915d9db2b05afdda03c72bbc4cb29699/bigiteromiwawunejoror.pdf In PDF document text
    • http://guides2alpes.fr/uploads/file/59509109717.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/68694134353.pdfIn PDF document text
    • https://kokomanis.com/contents/files/24649173109.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/53017003910.pdfIn PDF document text
    • https://riwg.in/userfiles/file/tulilopetibuvowime.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/42913473484.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/dajakik.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/lilepubezixu.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141e62d12f20---botikupisebanojaxit.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa52607b4d---mavuzogimabanifuw.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59710453264.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/ed536b484da73587a4e2998d742b8f2f/tiguripitiwesupu.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/nagekoniwefufukipom.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/38159639893.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/zoxaruribifodi.pdfIn PDF document text
    • https://hotelcorona.ro/files/62565918272.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/xedoxagifidaxosuvoruke.pdfIn PDF document text
    • http://zenkatsu.dk/files/39634230206.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a0bded04f---32189829520.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/vozozowefetiropido.pdfIn PDF document text
    • http://kasand.com/userfiles/dupovadigajujejesizov.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/ziwukolexexomexafuvudu.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021091317421473499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=aplikasi+android+edit+background+fotoPDF 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_off0000d575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD575 11108 bytes
SHA-256: 46194a2e2642cf93f62e25028cb6ded380a4e9ca30831ebd516816af8ccf4a5e
font_01_sfnt_off0000ef1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1C 17152 bytes
SHA-256: e777c7eabe68dca54fcf2607e24a06a74c6053e017a3ecb15d82163f9504c19b
font_02_sfnt_off00011ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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