Malicious PDF — malware analysis report

Static analysis result for SHA-256 314a1a39a9f248a5…

MALICIOUS

PDF

100.0 KB Created: 2021-08-12 22:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 50f6513cbc3257d5a046f459b923ee18 SHA-1: ee7fd9ceb7573c791b798cccc33bdc4809d93157 SHA-256: 314a1a39a9f248a50cc8d16429fb2d5d658ba48cf67db291cbf751f81d3a5337
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.klccpa.com/userfiles/file/ In PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/32eda43dd399c736cc8668f8a48e63a2/60392310885.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog//file/bosakapojepadomerag.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a94334c90d0---17185929779.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3dcb707e73---36763494726.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/elq7a007j5fu4dco9re7vg6l6d/xekejorirarikok.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/14807532229.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/fikiralojuzawa.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/66663690808.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/wurajimapubosisoriwaf.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/jaroda.pdfIn PDF document text
    • http://www.polni.si/Images/files/muvezevilawetiruz.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c71e38e8bf5---givemolaxo.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/xoxevodugokinasejo.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16089d59104027---josafubatep.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/40557050058.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c1947948c---83410791547.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/f6ee2b0de266ac78bb8e26d5fbbfc784/pixaz.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/dujogazapemugen.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01e8e7933f---86482745540.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b12f0e63a0c---20396504083.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b624f30d4---12311101977.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=ingilizce+kolay+hikaye+pdfPDF 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_off0001239a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239A 10752 bytes
SHA-256: 301a700ec01ade9fac31d78d424170efb86ad08bf69bb5f0a3813d1c56c7cda5
font_01_sfnt_off00013c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001542b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1542B 18384 bytes
SHA-256: 80c0ba3ee739cfb064d53071685ae11a8030895e28439782ae0adf44646b8389