Malicious PDF — malware analysis report

Static analysis result for SHA-256 a881aa703f94130a…

MALICIOUS

PDF

88.0 KB Created: 2021-07-20 06:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8d9d304e5f1b005df668751e1962f575 SHA-1: caa7bc4d0ae09d490847b2cefe9d8b4c53dac6da SHA-256: a881aa703f94130aee1eaeac184790cb2dfaf60fac271066d0d3c1646c88e2cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm hosted on disposable domains. Several heuristics indicate the PDF is designed to point users towards external, potentially malicious websites, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec63704cac---zosoluri.pdf In PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd6aec4a4db---gofebivedafitum.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/fagisodaz.pdfIn PDF document text
    • https://noblacklist.pro/web/img/podborky/files/tarunabijevedekukikusese.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/pitesijaxusavafixasulux.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/34846900058.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/pka7kb5gd0sbujl4u8s22rp5qa/39064821190.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/otktdb777qk8q94aou8priftv6/59576095504.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/12021751011.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f565103a163---bijisojoraguwejiginu.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe7ea90921---68972214845.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/vijufusede.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/dekalomabudoporujid.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/83aa5083567e8495b7a8bb0482e2d8f7/gikodupofumetaj.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/22091978041.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1626097121.pdfIn PDF document text
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/tajabumuronamovisujupopu.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/c8c410921800af3a1986148e5560de39/25366784968.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/89e4b01196204f396d66ad84264e4096/94190911429.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/361e7718c8edf9d50599e6babdc9cc0d/66623130870.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cedeb05f50e---57733207115.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/manadixafix.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/caed5fe5cf1dba1a696506ee052a7673/ruzorimanaxuzatila.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/kasarivigudajawojem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=basic+computer+hardware+and+software+pptPDF 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_off0000f369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF369 11076 bytes
SHA-256: a1345e92f3ea1f3e3974d287b4cf374172109b6a0db1fe0e6dd6ffb7fc59f70a
font_01_sfnt_off00010d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D28 17448 bytes
SHA-256: cda5678c28876f01160591b63b94d938c338cc15be0909f23b4a229bcecde01a
font_02_sfnt_off00013a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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