Malicious PDF — malware analysis report

Static analysis result for SHA-256 eefbad97c3675fa5…

MALICIOUS

PDF

89.5 KB Created: 2021-07-23 11:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c42f28bf76d6fe54f0848671ff33f777 SHA-1: 97acfe67d5fa50c65348f69653b37f4575f6d945 SHA-256: eefbad97c3675fa5bbdc386ccbba7673c99e9ab947580f73d368f4b8524f984f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO poisoning campaign. The document body was unreadable, but the presence of numerous external links strongly supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://statewideroofservices.com/clients/b/b8/b825a24af54c157c196cf52173d75bf0/File/kexuxipugevi.pdf In PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/16319869143.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/71813069463.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607080dac2b64---jatosimebagusawisaxop.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/30930851304.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ad116777143e5a16984949603fbbbda/51192657013.pdfIn PDF document text
    • http://splogservice.ru/content/file/23154823865.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/dopofu.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/72166366269.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/d00fd0d7f9779edac9bce4918c0dde01/21613217785.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/78193463839.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/50000342080.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/17a30d8f78c652c58d8fd1afcf35e6b2/86521446028.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210705_BB9DE73A8637CF4E.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcf28cb88d---99456316646.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160929ce694326---sidelowikuvuxazinopa.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/8397003039.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/b3dedaq3m8a6hcv2pfs1702g73/zomamari.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/gu55tmufngvgqqhoraeq7jp7q9/35627415946.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/6592625688.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa43e6d9b3e---zizitelitazabudejesiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+invisible+man+fullPDF 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_off0000fd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001151c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151C 16756 bytes
SHA-256: 10f0768a12c96d3875c1a1a2387fda680aaf529d0f4495aa50aa8c6d15c54d13
font_02_sfnt_off000140ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140EF 10428 bytes
SHA-256: 2162808f366183f7ccc4470793895feb5f9f3e61f9b8c04170f4049a37006319

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