Malicious PDF — malware analysis report

Static analysis result for SHA-256 878722cec9558b40…

MALICIOUS

PDF

71.6 KB Created: 2021-07-03 09:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d4a28f0e05e153bc54c9aae8814c53ed SHA-1: 4ed8d57c7b4f21354265db5892b2f7141c939a77 SHA-256: 878722cec9558b40a9137183dd61eab8f3a6a9e0a42e2645f902a87ece623e0f
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous other PDF files hosted on compromised websites. This technique is commonly used to distribute phishing content or further malware stages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160905d5e82293---retudi.pdf In PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/nufitupezazijipesum.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021062709574775354.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc3f8ea424---delewulenomopuruv.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/12f72e5ce4b7d41886774a317ad95a60/90652324147.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f697b78651---93113842398.pdfIn PDF document text
    • http://erdbau-rauch.at/65919933064.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aacecc44592---biwakidis.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/85593680677.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/43395619103.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160851ec734ea8---15906438507.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4b0a52dc8---29751618080.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/mojozivefatajupok.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/24645810113.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/lidar.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/22217254679.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd42b1e8864---56036491023.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/aa552a04a353e284589a51316433950a/kopukojokomijuzu.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a052e12c7c---jisum.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a871e8042ab---molawifowuduvidezeg.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/9r7ok869o8n33vih33hf88k4ph/foxinututesozenekaruvut.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/9381311526.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/533daaa9581a7d713953ccc49c05c38c/gulumorujemew.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/10098889153.pdfIn PDF document text
    • http://yuha.be/_files/file/nonifitiganinolopar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+make+money+fast+in+skyrimPDF 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_off0000bb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1F 10612 bytes
SHA-256: 4f723f1be4c8c35c9199f15dd7882439d69593b70ad34f5a7cb1489269b135c0
font_01_sfnt_off0000d36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36B 15056 bytes
SHA-256: 82ca7217144afba805c89cb051d072be16ede1b860d39322c7a2b02781807934
font_02_sfnt_off0000f9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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