Malicious PDF — malware analysis report

Static analysis result for SHA-256 c792855f414d30a8…

MALICIOUS

PDF

119.4 KB Created: 2021-09-04 02:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 547027b8dab4058d41d981a1eab93b2b SHA-1: 5152c0835da9626ec0187df922c29de130fe8aab SHA-256: c792855f414d30a85d3b97af2ac8d0cfd306534320c106895727af013903dd5e
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised websites or disposable domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://southwestlooms.com/admin/userfiles/files/81879436183.pdf In PDF document text
    • http://camelliafb.com/uploads//files/202108121948543233.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/xixuka.pdfIn PDF document text
    • http://sharise.net/Uploadfiles/files/58590256757.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607faf1a491ab---pafifed.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/bevumixegoragas.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/161000018941dd---mupenizolabetovodopez.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/i35o5h3qlp4h2ajt0uubp9u4u5/najaxudalixujidox.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/36805921039.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/wudajifuzazaxawebosi.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/wibotomupisutezifepuma.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098925579c82---34941908568.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/1126991123.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/gerobuzilejumonesobez.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/58660826195.pdfIn PDF document text
    • http://haus-st-otmar.ch/userfiles/files/datafositesulu.pdfIn PDF document text
    • http://donghotam.com/luutru/files/kigupubugetuzofegedufut.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/motamafox.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/94407799093.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612577ffca8f0---tipapasosukimed.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/8tau33ek7g7glev0n189q230tv/13825010827.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/bunadixamujumedix.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/61396040284.pdfIn PDF document text
    • http://www.moyekolodin.com/files/69241265686.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/defev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=l%C3%A4nder+der+welt+liste+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_off00015f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F64 10508 bytes
SHA-256: d7a6bf780f4bc66b1f27fbc6d0078360291e8f7fc734b0624d267e848279ac28
font_01_sfnt_off00017755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17755 24796 bytes
SHA-256: 2105c1e13ef40e096ccb281e10d635b639fa4f5ef4bdc03a7adc821e83f98fb2
font_02_sfnt_off0001b5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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