Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e1e2ebc7bffef9…

MALICIOUS

PDF

79.2 KB Created: 2021-06-13 09:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 23f6716ca38c16f0f8bbf78c5fd8edf4 SHA-1: 5309116cf0bf80b9c4236fd8086ca2aa3ddb1bc5 SHA-256: 98e1e2ebc7bffef95ed1ac1326cc49241b962bcf3af3b06f010edb32f1a57cb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external URIs and links to compromised CMS upload storage, suggesting it is designed to lead users to malicious websites. While no scripts were explicitly extracted, the nature of the links and the overall detection strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=funny+puzzle+questions+with+answers+pdf PDF link annotation
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/346b857ae99992823418dda474d69baf/nuniparetewekem.pdfIn PDF document text
    • https://afayl.com/userfiles/file/kidilemimi.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160827732bff95---19813370784.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/55351145809.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940672ede04---95937315431.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/duzizu.pdfIn PDF document text
    • https://t2sc.me/userfiles/bulipigadonuguvozupizuj.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16074798ed9560---16937141311.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608efa0e00a87---luvifogadukosomadidigago.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/30941082694.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942432c1b85---sobadekudanuza.pdfIn PDF document text
    • http://arslanemlak.come/file/71636526195.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/28667272980.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076c3ed73d3c---pelir.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf841c7ddb---98368278835.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2575a4677---68232243721.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/65aeec9e37c943b3d19a0af05226904c/gojirali.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AC 5456 bytes
SHA-256: c898ad81d7853e302376972803f86bbf40bc0e9f583b1686a3b5fc909133d783
font_01_sfnt_off00010b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B54 10500 bytes
SHA-256: 2aefbe485609b045827550e6f4cdb2d75de8fcabe601051535d812d884a580c5