Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd6ffb11ac8dd9ad…

MALICIOUS

PDF

91.8 KB Created: 2021-06-13 01:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: cf326a9a12eb0a45b13f46e4657d2ecc SHA-1: 9328bf13c4bfc2f2b349817c132f27179e6df579 SHA-256: bd6ffb11ac8dd9ad3d7002216ed5c286096978bbf6766472db2220775aa22e79
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://allytemp.ru/uplcv?utm_term=imo+olympiad+workbook+class+8+pdf PDF link annotation
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a1e2998d4---mojawufulivilivutof.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/6fbb570c29cafad4b8a85f550bc35af9/75506028626.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/a176f0f096f6df7413633643d488214b/35515937797.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7df581a76---25262194605.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/22af9ab54d069a6516af361cf4b24cb6/jexekiwuvuzubekatugogef.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/163021219.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/n64fnnogg6kgfme5406jetmp92/lokisixotilebad.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/74643100450.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b61bcacdb---vesonevafeliwegerowu.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/5bch3akdqilcd5jbeg08cec0q8/23328971270.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/vewiduxesiraxakudit.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/mojuvuvokobajenari.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/je0ocdoqqtf223c86dtaksjf52/77940017681.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/buzorofixozozugim.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file/%5C/2021061305502863.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/wimuraduxufawozovafubo.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/94142816228.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48149e623d---37989146516.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/gegagusinufusukofe.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160930d793c1d4---jezugisosexo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001184a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184A 5312 bytes
SHA-256: 6fea3813947a34be985cb5b853f4bff5b0d19f06fecf937f32015f9c868cef45
font_01_sfnt_off00012a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A58 12192 bytes
SHA-256: 7942e97bc607b3c75b810a3b99fff24c81abd93f06fdad6808d35dbd68001139
font_02_sfnt_off00015380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15380 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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