Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6a851c0169a35eb…

MALICIOUS

PDF

79.4 KB Created: 2021-09-23 23:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9c22868234751b9e990c6fcbe7fd436b SHA-1: d7081fd8af17d7cd424fa1fd7b10cbcd379f20a6 SHA-256: d6a851c0169a35ebd2c5e36ae04dc655e3285af235fce30347a117be7f810087
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://wastran.ru/uplcv?utm_term=paw+patrol+minions PDF link annotation
    • http://pastadimatteo.com/ckfinder/userfiles/files/96948423549.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/90786366584.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/48091166392.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210905195402.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/1605318029.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/xowogelotigonepewusosi.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/tuvikarifepe.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/3420971405.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/t133ks04trffqsu1sam56js6qg/72214099690.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021091807013170554.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/tanifakugasi.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/45668673070.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/suzowelegeda.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/20628736649.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/niberakopabiluwep.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/bosakinefagujovazegilit.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/86362466096.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210914172801.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/a3ebtk0vope59p0sh9m8h5noh0/70543352098.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/55470814648.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a8d0baff5---43016627390.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/96424603088.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/kogamugetagugezo.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/favopigukiwufu.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/64813002011.pdfIn PDF document text
    • 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_off0000d3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AB 17388 bytes
SHA-256: ccea3997d551f04e1b4f19c822ac3f0de4d9b7b01bcd7ef0c1223964ccffd2c5
font_01_sfnt_off00010080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11897 10368 bytes
SHA-256: 8b99f4e3a5f0d96cb5d9e2c6a0e9f0cda411a1ca465ba14e24ce6fbc6a3595c3