Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3cb8edeaa654fe3…

MALICIOUS

PDF

107.1 KB Created: 2021-09-03 05:38:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8e5f117e8fd16b7f3b0a73a49e2b9174 SHA-1: 82d288fd034338fffbac68e2c3a8604479413a1b SHA-256: b3cb8edeaa654fe32a0c626ea04ca5e79ebee777b57315d8337ed1e9ce6b5df7
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs, such as http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2a4b80ed5---45199986806.pdf, are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/956db7635529c8ace58b1808aeee5698/37832985049.pdf In PDF document text
    • https://aashianarealty.com/file/1074305995.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/ed8dc300fd9eebfe9e6b913af1a3f54c/16619140043.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/tipeg.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/10277267702.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/9c0c0633173ca7ee91e8637ac7cf479e/46066134651.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/76927a8955831fc795d444674141188b/mowomav.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819bda788d2---digefala.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/a7a587ddc4ffd887d50c9ac2f171aafd/pebizexiponexeril.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202151072892371.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcaca0b110---70298769386.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/6db26846396f6fbded05c8b1fb56552a/21730176739.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/rofikofemidamerupemejo.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/zimekepegerabo.pdfIn PDF document text
    • http://builderall.info/userfiles/file/liguwezubebezo.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2a4b80ed5---45199986806.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/fimamajurubowixi.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/a61839b85dadfb5299076254b31ad714/jezuwizev.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/nemaralata.pdfIn PDF document text
    • https://novitas.ro/files/zudonuwuteferadebukovelez.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210704_87E7A8B6B7B42601.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/bf4bf2ea08c99bca3b7f1dfe3c9c45c3/rinotumesitulenaxunafub.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841e8609098---74231944624.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16120dfa807483---99171477173.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=fabled+lands+the+war+torn+kingdom+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_off00013be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000153fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153FC 11240 bytes
SHA-256: 765cd5b368dc563d01c54bd59e9d9dbb69f3bcd9c59056d2b4a56d6faeddf37f
font_02_sfnt_off00016dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DC1 18816 bytes
SHA-256: ab793e36b9859618942225095e617b6f11137903f5625a423c4e32ca18497651

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