Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb2306ed90ac7e6…

MALICIOUS

PDF

137.4 KB Created: 2021-07-04 01:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e731065f06766c028b3da6785423390d SHA-1: f9aad7b4bb2a25b8c69e1b3aca619c8ad3e7bd5e SHA-256: 3fb2306ed90ac7e63998e3adfaba630084482bbec10689b49b3e1e24e629f265
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

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://www.urbanwaterways.info/files/vezazoteruvariwamo.pdf
    • https://stcc-sa.com/motakamel/Ups/files/45307198895.pdf
    • http://dr-onesrl.com/userfiles/files/94918026320.pdf
    • https://info-jimukyoku.jp/lot/upload/files/fekakazazaro.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072389c0170a---75137274043.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/26732e0555bb4bc999dc5cd721e8e217/vusinosuwifitarenafek.pdf
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/gepejiwubipuwoged.pdf
    • http://psychoterapia-przemysl.net/img/userfiles/file/zoger.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d7d5c37c0---latojurowob.pdf
    • http://podlahypilat.cz/admin/file/volobizidozasuwapoza.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fd7bcd12e---xuvuxubumatege.pdf
    • http://nuestratierrapremios.com/campannas/file/90763036961.pdf
    • http://archimax.ch/dynamic-images/cms/file/72874889988.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160946e1fa2c7e---dakebalipok.pdf
    • https://banghenails.com/upload/file/xobugonibodowukodib.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb760aa278---60930122548.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160743ec6bcc54---99541220641.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3486ceb40---daroze.pdf
    • http://automsystem.com/UploadFile/file/20210504112216399.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fc2da68e8---48139710601.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/uk0jut4nl44u06vgme9n1ep4n4/52281995892.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a291c8660d9---vejikip.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eff577d226---38779261660.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=planets+in+order+with+asteroid+belt
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019c75.bin
338cc954a946a7fbf70b29c55d5e66db99b2ef151e94d540d22e7b387f44db23
pdf-font-stream PDF embedded font (sfnt) at offset 0x19C75 16232 bytes
font_01_sfnt_off0001b255.bin
fce349f99dd4bcb504feff91e53519a7e6a4932f59272e8f70ef5159d2f290cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B255 10572 bytes
font_02_sfnt_off0001ca73.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA73 16792 bytes
font_03_sfnt_off0001e285.bin
39dee48440f60d8a5a086757503a3243af445474f93aca83ad7dc7825c265440
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E285 20484 bytes