Malicious PDF — malware analysis report

Static analysis result for SHA-256 17bbde873c3a5099…

MALICIOUS

PDF

72.6 KB Created: 2021-09-16 16:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 868704b2e0fce75cf75790af9a5b0a7c SHA-1: 64f22fa273f12a1e006c17d3f9324d0f024be3a0 SHA-256: 17bbde873c3a50999e411ef0af2a8a78fefb1ae0f999e9e15c5fbf07f70a9da3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on such domains, often with UTM parameters, suggesting an attempt to manipulate search engine rankings or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=friv+scooby+doo PDF link annotation
    • https://www.fangjin.org/ckfinder/userfiles/files/rimadozufitudenoku.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132eeff169cc---94849324066.pdfIn PDF document text
    • http://matrixpaint.com/ckfinder/userfiles/files/vafixabudefamituru.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/43473392042.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/82632173339.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/dutufomofaxudip.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/malir.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/b2dcc66ab8bf065e25c77c0e7dbcd678/55543542281.pdfIn PDF document text
    • https://tpk-m.ru/files/file/rimelolobag.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/bodereje.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021090806534373499.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/49588153711.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/tibibatenesapofoxevanede.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/aa2720e8925bbae0e1b971e049dd4a36/24658233813.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/bolusediwuredizavus.pdfIn PDF document text
    • http://feminella.ro/upload/fck/76113548938.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/25683700032.pdfIn PDF document text
    • http://doctornhospital.com/banglanews24/editorsfiles/files/jivilene.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/63745541942.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/situpebonulogizejuvi.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/kukomubelo.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/derudo.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/pebolamajiwosirera.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/nefuwirojatig.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_off0000b86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB86A 17972 bytes
SHA-256: 272cc0cda60af08d34a79de4caf26ac2a5193ce804a59702ad7813730a47fd2a
font_01_sfnt_off0000e60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60D 10120 bytes
SHA-256: 8b43601f8f0d726f9acfa58676bd5537b70cd9ab3c4cd9f948231b4bd6ebb7ac
font_02_sfnt_off0000fcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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