Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb4bdbcfe71a846…

MALICIOUS

PDF

80.4 KB Created: 2021-09-13 06:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 62cc9a5cbd17212994644a3f121acb8c SHA-1: 182100d36eb0d2b75facd05b77b25a17a6facfbf SHA-256: dfb4bdbcfe71a846ef07dd0f96ac09ccedd97534bc3ba319ae29ac81ce7b655f
196 Risk Score

Malware Insights

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

The PDF contains multiple links to external resources, many of which are hosted on compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. The 'Remote-support tool lure' heuristic suggests the document's content likely instructs the user to install or connect to a remote support tool, a common tactic for phishing or malware delivery. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards a malicious intent, likely to trick users into downloading further payloads or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://genbreedpublisher.com/files/upfiles/file/sivobivorirukojepalaj.pdf In PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/36279583867.pdfIn PDF document text
    • http://domplus.su/userfiles/files/50347773863.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/regiregusetexataro.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/92892087577.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/zoteluwuvu.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/jakab.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/10730881512.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613278b61788c---jegitakawajafijawikibin.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/nirasemifomifuramasi.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/xidabuv.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/ziwux.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161362a2e74a71---nitabajiziliwunasifabizem.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/65617304243.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/27125317801.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/88949122364.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/toziwevefemefadodor.pdfIn PDF document text
    • http://dgjst.com/upfile/file/94277117023.pdfIn PDF document text
    • https://schmitz.cz/res/file/56806400048.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59198105913.pdfIn PDF document text
    • http://ore-processing.ru/d/files/mabatojepuzif.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/93834839401.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/fdb2b5427b4c9a01f9acb129221370b6/80347908057.pdfIn PDF document text
    • http://ktcz.eu/files/files/8893007523.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/pavuzosediwix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=share+your+android+screen+to+pcPDF 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_off0000d338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD338 18300 bytes
SHA-256: 377dea06537fc5d1a3c0d4ff2cb50344140c828f78e00ad237f3c19ca511a243
font_01_sfnt_off00010289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10289 10852 bytes
SHA-256: 1674de25218f9ef2a616b797eb31de69d37e3152cf901c3b5338086097dfa584
font_02_sfnt_off00011b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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