Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac47e05a3371df6b…

MALICIOUS

PDF

78.1 KB Created: 2021-09-03 20:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0b278e4ac6ac04037a253633740828d6 SHA-1: 0dc43ad4d6777e96b35a81ce8e81a8758c37bb6a SHA-256: ac47e05a3371df6b455302ad4110958bc02968617c8ecfd87b6ea2dff847953e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious or phishing content. No scripts were extracted, but the presence of external URIs and the nature of the heuristics indicate a likely spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=cultivating+curiosity+pdf PDF link annotation
    • http://ippinnudon.com/uploads/files/64990668308.pdfIn PDF document text
    • http://aplus.to/userfiles/file/xaxekugoledufuveziza.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4baf5980b2---zizisagozuvital.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092874748756---febevipukilunaresapogojam.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/pabujo.pdfIn PDF document text
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/64412649179.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/69107959894.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/35374080679.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/bivoxipefawiligal.pdfIn PDF document text
    • https://value.ae/userfiles/file/dinarewu.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/wolaborofukimasasu.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/fasewapudinu.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca66bdbf54---xixevupajesapewe.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/54925455704.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/dosesokakumekuseseneker.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/40131028901.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a191bb484c9---69447153545.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/vemog.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d462ddfe63---86255073766.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021081300303132.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/0f0b916f8d5ff24c1b60d0bd12854c58/mudenodaje.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/94910737603.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e7208f5ca8abfa92779ffda2b4469c5f/moziletezetale.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/55c83e9a3e6ad0356b89ad7bd609218b/zuxirozuferupaxifagozipun.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents//files/sexirubofuporipofuteg.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834e2603874---84793584502.pdfIn PDF document text
    • 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_off0000cd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8F 10972 bytes
SHA-256: 856d186545413e8884f8e8d2e7c3b66d9ce3185fbbfc4b289fc9ab1c2f2f174e
font_01_sfnt_off0000e706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE706 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF18 16964 bytes
SHA-256: be262dd5b3715f257d2d1724934bafdd6e8ca0b17ba70c71db1e3422c3197090

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