Malicious PDF — malware analysis report

Static analysis result for SHA-256 e54cdd3e9e5cb3a3…

MALICIOUS

PDF

81.6 KB Created: 2021-09-01 04:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f74c3fd3779b639da85d00c45cb064c9 SHA-1: ddd35b69eb6ac6f349f89c00d804e08150bb91f8 SHA-256: e54cdd3e9e5cb3a3230fa56ce997ccf44c7be69ce1c5a2d70c0179afe49e79a8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to various external sites. Some of these URLs are hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute malicious content or engage in SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://karolinanowak.com/userfiles/file/16635368108.pdf In PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/tepif.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/37415437597.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/77158647082.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/64345340198.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c70f1d2735---17072561676.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/71429459906.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/a40e7ldp5e5q8t81tpb1fanvoj/kafizejamixefijuza.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/30225193335.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-21/20210621185018181707.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160967e420e89f---misebazuvilupiwex.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/8029018298.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72c3ac03bb---gusujulatukakafena.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607734d18b605---jisotoz.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/bikiteluralusurinuvuzago.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/3885999021.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/7082116114.pdfIn PDF document text
    • https://loctra.net/userfiles/file/67722778550.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/816ca19827aadacfd97506140de92f1d/44047793266.pdfIn PDF document text
    • http://soveyautoparts.com/htdocs/cljr/data/files/43257476853.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b8086376454---6298308782.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/wupelofofamufevirozok.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080b0cbbf208---pakopevikazagolomomonif.pdfIn PDF document text
    • http://iucecb.com/files/file/fopejaruxujenafelibirewo.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608dad8c5ba69---3521333681.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=the+name+of+five+fingersPDF 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_off0000ddcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCC 17192 bytes
SHA-256: 5ce28ed79ffc34c5aeed62c5ca85135f5b3c79dc59fe677d9e5bcc89dc7e7489
font_01_sfnt_off000109a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A5 10544 bytes
SHA-256: dd9101c2d68e894b9c3d77294467977691a03813c51a23f91a75412ddf302fec
font_02_sfnt_off0001217f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1