Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc38ae71b7cdf880…

MALICIOUS

PDF

71.6 KB Created: 2021-09-18 22:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e0076fb07a6efbcfaf0964c460c89880 SHA-1: 479628ad1771921a20254209b45b6daad2826605 SHA-256: cc38ae71b7cdf880c838d9136e9a81b2fd0f868407955b0a5b837ef7ebb41518
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection further support the malicious nature of this PDF, likely used as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pixomot.ru/uplcv?utm_term=fortnite+codes+2020+for+skins PDF link annotation
    • http://thegioimercedes.com/upload/files/367375651.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/83783304092.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/61e12cd3ab9139eafda203ca62cf470d/soxaxodugorapofore.pdfIn PDF document text
    • http://precisao.net/files/files/geluxitum.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/72547558025.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/37549720690.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/mavupukebigi.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/24814448948.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/47550969063.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2b6b5cdce---11995892593.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d2d794a6d---fuwonewaxixine.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/17442305271.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/75341596535.pdfIn PDF document text
    • http://vuadiemtayninh.com/hinhanh_fckeditor/file/23687982789.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/43536306405.pdfIn PDF document text
    • http://vtaky.sk/media/file/wepulan.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/domeboverididuvijoko.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613acdb111ffe---zazidenu.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/89456890214.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/81438232687.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/psvhvn0jvbacqgd6oto0s4smbr/13099628710.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/bumoma.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/mufewifukatobedan.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_off0000b0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D8 18300 bytes
SHA-256: 7f160d63a0c218167ad00644bfd08340b1c5e04835cac6093ad86aeff6dcc5bd
font_01_sfnt_off0000e0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CA 10572 bytes
SHA-256: bfd5fc6e0d557585824cea035139be447afc65c8eb2a738c5872e4a5ea7082e3
font_02_sfnt_off0000f913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1