Malicious PDF — malware analysis report

Static analysis result for SHA-256 62a3851e80b00a4d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-05 16:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4f13b7b5a4147867fb1bdf3047933b7f SHA-1: c465a96c66980eabf7a00ddb198a7df972a8fb29 SHA-256: 62a3851e80b00a4d66cc41cce949bf9dc8d98a7a973b339442eaad09d8aad306
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 numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs indicates an attempt to lead the user away from the document to a potentially harmful destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://nomylo.ru/uplcv?utm_term=maintenance+strategies+used+in+engineering+pdf PDF link annotation
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3198223ea7---4093376698.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16097858b9590d---17351426281.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/xorogadebu.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/f678hb67q1apou84tcj7m78mv0/96403496252.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/80667450539.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/78212856147.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/benefojap.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828f5b6f8f5---15494507516.pdfIn PDF document text
    • http://andrejc.si/files/file/53790710715.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/reronaregesofox.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7960db47b---litobaxelaxij.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/24118639383.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/fozanijebokulojigajuda.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/06505d18ab813a7357409d29318a7134/jeloxetosu.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/nefuxuveparidizepukabu.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/26907462394.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e68c1e469c---xunin.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d8841582320---28192602932.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/jopum.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/nizozexuwogako.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/vefagexepuzufilomefubupaj.pdfIn PDF document text
    • https://medtek.vn/storage/file/sefabopetomekukifikeb.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/3ftaaqci8nq4cucfurpb8cs10e/11523699306.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/sowoxufoged.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/8982197707.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/pupugiparak.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_off0000d752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD752 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF64 17672 bytes
SHA-256: f51423fb12b70da9a82603d265cef1bfd8eda3ae3c10ebe608a559dbcaf280fc
font_02_sfnt_off00011d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D51 10724 bytes
SHA-256: e4189f4738b8d06d517cf758c97b2c1864952261430499795d92f7b4629ccfb8

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