Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d9d8a922f3d855…

MALICIOUS

PDF

379.2 KB Created: 2021-06-11 12:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7d07c1b4fd80a874cff605021c6ae64f SHA-1: c3746dc8658f4e76cacfea580ccc262f64d2434f SHA-256: 13d9d8a922f3d8556f83945e3f0a723509ebd335e904c31e12e68dc8a00c5aff
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains a link farm pointing to compromised WordPress upload directories, likely serving as a lure for users to download further malicious content. The presence of embedded URLs and the nature of the heuristic firings strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=ek+din+teri+raho+me+mp3+song+download PDF link annotation
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/7659cbf64bef7d943e09da9f493799be/51770053535.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/23657163167.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/59325158219.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/dumigizatetada.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe2093cb0e---sanikereganewenikijaw.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/cb1e371973046d1acf0e57a59e437622/dejonibedenuruvuf.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/pozamupitozovotezodilew.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099f032eb654---86082447715.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719a226cda8---13325533606.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1835824ac---semedorubegeladufadufi.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/13720048941.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/d7f8dc20ecafe578c806320bb19d60f1/30515570238.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b09dde91f09---23424070457.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/vojunazetomug.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/voxojetesuwutoz.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/mozakexoruz.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_off00059816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59816 5440 bytes
SHA-256: 6a280d7a3a6640325cef62f35778ba83d4e81be158c3db34279f179b4ba4b96f
font_01_sfnt_off0005aa75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AA75 11252 bytes
SHA-256: 944c39574011cf8e53ef5410644537472bd918bd46cd6e46f99a7131efe1e933
font_02_sfnt_off0005d0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D0CC 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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