Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd257af5edcb04b3…

MALICIOUS

PDF

82.6 KB Created: 2021-09-22 11:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 278707d6c23f7c5a3525a6813d70ca17 SHA-1: 840f2046eb1f39660b5cbe4b44dbc325308a3463 SHA-256: dd257af5edcb04b34692b073ae4d8b6c86c0717badfce40c50717f6dc72d6033
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple URLs, some pointing to compromised WordPress upload storage, suggesting an attempt to host malicious content. The 'Remote-support tool lure' heuristic indicates the document's content likely instructs the user to install or connect with such a tool, a common tactic for phishing or malware delivery. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ekoelprom.pl/public/images/editor/file/64539953121.pdf In PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/dovejuvuju.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/fisibutezodarazanarifume.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/8661587010.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/zezeladebenegesuxivezoto.pdfIn PDF document text
    • http://strap.sk/uploads/files/jukudad.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146293ed308e---37654828532.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/pagivenizo.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/jenewafopupepatilasis.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/85939309276.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/38299344255.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/a3t0hk1pql3aovis8msnmghl7q/15655319969.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/56075064380.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/zosejasol.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/mefulesolipogupolewarito.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/dadaguxuwuzata.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133673b61cb6---bunamitarilatemow.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/zuwiseragu.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/35124286003.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16146e0f8d44e0---41855606596.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/15558589788.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161332903f2e72---kiruzasevosife.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/rofit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=vidmate+app+playerPDF 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_off0000e1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E0 10244 bytes
SHA-256: 5174225c52a34cce7543b1439c7fb9f8d79f249c137033558182e3a8e9065142
font_02_sfnt_off000110da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DA 17024 bytes
SHA-256: c50159d7707fa6d3ff53d7a298c66b7d9fb4c3d8f6b6bcab44bc150a93fa0ab9

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