Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a171ef077e8a44…

MALICIOUS

PDF

79.3 KB Created: 2021-09-18 22:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d5ebee27c4f46123def5f8535fdb80da SHA-1: cc4d51160b835d18ee9ecbb65506acd46b886ceb SHA-256: e5a171ef077e8a44101f8eaa77e946396846e797f229ff021166bd2529c4d35a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://worldcastlive.com/userfiles/file/72231954373.pdf In PDF document text
    • http://bio-scan.com/userfiles/file/gerizijofefidanakazejowuw.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/sosininibudu.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b33172e73c---49234122405.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/fanofokifuf.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/60592526916.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/eabaeb5229fb2d2e6dc7d3faa3a5e962/tuzunibovawokomafot.pdfIn PDF document text
    • http://espokebar.com/uploads/files/94495081945.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/dogajazelaf.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/keleko.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/wajikobevonogonezon.pdfIn PDF document text
    • http://e-instar.com/userfiles/file/34475891987.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/65312872461.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/20881686439.pdfIn PDF document text
    • https://wsbtitan.com/images/file/40772685850.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/sunudiwazenonodazugo.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/zasenezufizozewegi.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/7807319352.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/504014219.pdfIn PDF document text
    • http://viorina-deko.com/images/file/zutosisomifomamoguw.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132449205085---kalenumegasuxubemat.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-12/20210912215708742364.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/39632777342.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/komesexob.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/15747545825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=minecraft+build+hacksPDF link annotation
    • 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_off0000d265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD265 17192 bytes
SHA-256: 34c6e78fdf0b57ac6e59d5b25baf00df722d36cfb3a7445274dd03216101edde
font_01_sfnt_off0000ff01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11718 10780 bytes
SHA-256: e1c5d9487d521b7000952e34f0d20fde4654e115e8805634168c10773f7f0fbe