Malicious PDF — malware analysis report

Static analysis result for SHA-256 edef1128522e740b…

MALICIOUS

PDF

79.3 KB Created: 2021-08-26 05:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 97c4de5746539b657b6a4facd1791640 SHA-1: fab3649e71eb86829551b1aa05d45c291998777d SHA-256: edef1128522e740b94d61ddc2f56277669208dfd288f495f252360179ad21d45
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/8b80f864accec1ecc78575893e99545a/peluwipifavizugorenuso.pdf In PDF document text
    • http://temple.mo/userfiles/file/silel.pdfIn PDF document text
    • http://www.bash.cl/media/file/72018068790.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/44695352615.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/49725698877.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/97526021862.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/20287556182.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/7614253969.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/nuxakozigir.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/0009c8f7a4c7dfc296a127f5fcb6998b/78037062959.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/66535723151.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/606d8338f618793273f76eb71cf5ca51/28367237216.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/e792705d974cbc23c49d7f29c6c21794/damamufunazunaxigexilo.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/pobapaluwopa.pdfIn PDF document text
    • http://ninfahartman.com/clients/d/d5/d5ac6782717b6a1c58177985440d8e57/File/68772164130.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/66488493880.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/15966927022.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/86237937342.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070478df0177---pudozetoj.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161159cf398945---rukisinilaro.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/50a21bd09f3594c45e080011f50f6771/93021442417.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/xatijolerasitefubewez.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/78407026290.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/55dab4e668c60a98444e376cb88bbc52/fuxolutogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=largest+tree+in+indianaPDF 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_off0000d5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D2 16648 bytes
SHA-256: e8ba8acf67de90caa5c63910d1bd205205de54d3d20ab519aad90623b7c700eb
font_01_sfnt_off0001018b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A2 10216 bytes
SHA-256: 0d05aaf81ece45a0f0380ab0fa7c30413fa85b4ba5717f49d83171ee66775d03