Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb04fb53f562b4b…

MALICIOUS

PDF

92.8 KB Created: 2021-10-14 06:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e3f6d896eb218aff3ce9adab28136744 SHA-1: a2a47991cd308540dcbcffdcf07a56943f506fc5 SHA-256: adb04fb53f562b4bf7b3069cdce9967bb23e631a7674ff4510dbf9762327a3d2
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://africalegal.nl/userfiles/file/16258767801.pdf In PDF document text
    • https://stealthwindow.tw/uploads/files/202109241633543295.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/konutomepuge.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/werepa.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/9bfddc1b6b06930f0071d94801a4b735/84472660631.pdfIn PDF document text
    • http://scarpatti.com/files/ketorodexakasani.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/49616862790.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/67744917761.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/58113362612.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/87692750916.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/renewezi.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/tifevebakemideturi.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1616137136ce7c---15048616612.pdfIn PDF document text
    • http://bienbao.org/uploads/files/4939116594.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/paganoloroz.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210914085938.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/74086837613.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16153b752d2f0d---210294483.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/tigelixusomekasagizos.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/zajidon.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/42113227345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/5bhJmFgkeCE/uplcv?utm_term=how+to+get+melted+plastic+off+oven+heating+elementPDF 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_off00010203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10203 11112 bytes
SHA-256: f8195eacaee9e986becf1e2d580784c3b47f0866119e391b6ad9bd5b2c1cce95
font_01_sfnt_off00011b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A4 19204 bytes
SHA-256: 5155243ab58d208b8b42e1401f91015471e32a45eb1c3609361957411d50f4bc