Malicious PDF — malware analysis report

Static analysis result for SHA-256 88951e2e903687a7…

MALICIOUS

PDF

71.6 KB Created: 2021-09-18 14:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1527af2af03b42efad5e2be5b4661a90 SHA-1: 841fbe9a3379f595c19d4a3f5a022d5e993208f5 SHA-256: 88951e2e903687a794fc300abfb18281d168f8c15e1b18b08875d853e13f2041
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://doucetplasticsurgery.com/ckfinder/userfiles/files/worejes.pdf In PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8b1b10f56cf547cf6a87d08f252d17b0/metomarowu.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/18853291780.pdfIn PDF document text
    • https://airxps.com/userfiles/files/wefadiwedavaji.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/59346695461.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/62634718779.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/85581212788.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/10806321201.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/93564050928.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/bipedizo.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210917_C7B7A3123F19EF2F.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614464c85b2a7---gokojamizakajubin.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/30547730879.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/9384747661.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/zikikupudaxirub.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/widagugimovelosi.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1614245fcce8f3---81690252015.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/misidade.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/zuruvokunexusimo.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/kebomizulelarofejop.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/58881794639.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/42690685841.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/matoxowotowasale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=watch+pati+patni+aur+woh+online+freePDF 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_off0000b5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C8 16352 bytes
SHA-256: 8e9ce7a07a4c5f3966f808802592f54835762429c68cf80f8014d6e9ae1e8082
font_01_sfnt_off0000e034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE034 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84B 10588 bytes
SHA-256: 1538e809e42ca206626e847b533c502fc6d6116ffc5be39c3d03c1fd89444cbb