Malicious PDF — malware analysis report

Static analysis result for SHA-256 50bc0ebeca06a3e5…

MALICIOUS

PDF

72.0 KB Created: 2021-09-05 07:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 36b8d03014611eafb9d6ba3dd3beb48d SHA-1: 5b880eb35ecd071e77421a6fa9d5bb5244c6f356 SHA-256: 50bc0ebeca06a3e541419b12598205023c96e8bea21d59c8ea9394709ba1ee47
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to other PDF files hosted on compromised or disposable domains. This pattern is commonly used to distribute phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/3768454f556c57e35a81e7d1c44e9e46/dojap.pdf In PDF document text
    • http://opusbiz.kr/data/editor/file/1472240201610395ea7029e.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/f2dbee2ae161e356f9cfc4c2c28eee6a/fenud.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/7242869249.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/tdnmnvripksm31luno291aqa9v/jilufog.pdfIn PDF document text
    • http://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/nedatase.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/72283602031.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160860601c117f---6879748336.pdfIn PDF document text
    • http://arablift.net/userfiles/file/zupedetawujeliz.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-7-19/20210719115528936086.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1627333586_44a7ddea2a.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/c2b2460209643b56abac9a2243336dca/22368219353.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/164m5s1ql3bbd357hp436f3gvk/13209882534.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/kogunebevipaparetazedi.pdfIn PDF document text
    • http://sdds.be/userfiles/file/lominuwiki.pdfIn PDF document text
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/rafejoj.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/93b72d58fff604053120caead3d0c3e5/12862320681.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/tekibalemazalakuzatu.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b98c85e413---gunopeboba.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b590e1fd67---tedidobuwepuw.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/n643q9q1pt5lubf8ro1btrmsl3/73770132993.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610b281711a4a---vubugonoz.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089c32a4f442---13342170946.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=persuasive+essay+topics+middle+school+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_off0000b8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C9 15452 bytes
SHA-256: dcba03f59090a8b49c01f3b0df648ade883afa92e347af550500e34daf55fb56
font_02_sfnt_off0000f843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF843 11064 bytes
SHA-256: 5fc85cddeab3952280f10c0582ce2235749c80fe94ca88dd0e25625edf0dde65

Open this report in the interactive analyzer, or submit your own file for analysis.