Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f4bcac664fdaba…

MALICIOUS

PDF

96.9 KB Created: 2021-09-04 04:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5b8f50e3069b5daef495c3052bf56ad3 SHA-1: 23c88c12b3423e803da3c54a67cc8dbb7d2b1ed1 SHA-256: b5f4bcac664fdaba9d738d67953a3336bb0ea9439480bfddd2f6337c0540fa05
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URI heuristics and link farm indicators further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.gurgy.net/ckfinder/userfiles/files/jomerezuwobilulanuwul.pdf In PDF document text
    • https://abofahed.com/userfiles/file/24760388578.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/lisinutobekitidekutarigi.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e9298b151---manezubanekewunotil.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/furigoze.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/33453694108.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3f5a0258d---33899065918.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/bupakaniveliw.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/cf896285ed662732f6e7a4d2e29df335/norifo.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa65192cdc---xujazage.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/tilesinikumonorafofu.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/3kktj7vr5nkskcq5oku87nhuvf/kagapivan.pdfIn PDF document text
    • http://kccmaul.com/files/files/69549416421.pdfIn PDF document text
    • https://stopserv.ru/files/file/8561511380.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/71lt7ob48d9sf46tralg7ha1r7/76856949405.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d78464e0257---gewawetofegenuku.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070a48966d9f---mademogubibu.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/nezodevojesebosaz.pdfIn PDF document text
    • http://tykhchem.com/upload/files/70690872696.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/66751596395.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/dojogozejasujet.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607212483a510---86305814893.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=2007+toyota+camry+wiring+diagram+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_off00010ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED9 11012 bytes
SHA-256: e8f6c4d4e4a6f49b73721abf869eeafacda5fbd1d6df7a9bc791d1fb02c7c7bd
font_01_sfnt_off00012863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12863 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14075 20100 bytes
SHA-256: 0f47fbae643976c3e7b6586c91669fe51e4b9aba8755869fffa2a0394ce7f7f4

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