Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba76edaa92cfede9…

MALICIOUS

PDF

71.4 KB Created: 2021-09-24 14:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6247fef474a97adffde0ccebabddb700 SHA-1: 284e11e06ef3f7901ccfcdb806416ce30bfce530 SHA-256: ba76edaa92cfede99d7e91e83f163b1998b655dc7007e604209caa39a165b4c6
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan delivery attempt. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, forming a link farm designed to redirect users. The presence of these link farms and the overall structure strongly suggest an attempt to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://fsreloading.com/userfiles/files/lakarobarirexo.pdf In PDF document text
    • http://bebaldebaran.eu/userfiles/files/89433332004.pdfIn PDF document text
    • https://stotex.rs/files/51494524127.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614d3cc749698---sefodipopokenid.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/82763774739.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/gajizoxinesogus.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141766f29ef4---29213709.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/vaguzasimu.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca3b6b26bb---sefulozezefizod.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/gobevafaduvajigezuron.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/libuximeku.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/kawakoxoleniwirax.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/domerov.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/41394211605.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd1091e9b8---fodipuritaketo.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/suwaxulen.pdfIn PDF document text
    • http://www.ezmoving.com/file/24877998577.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/82606044565.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/6645512212.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/37495650420.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c212bc8702---25523433566.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/wetawokaviz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=instagram+2+download+androidPDF 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_off0000b32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3F 17740 bytes
SHA-256: 56da81f91bbe76c9c1eb848bdc5b126f906b58be153432a58d9e670a996defe2
font_02_sfnt_off0000f85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85F 10616 bytes
SHA-256: 395d66511cebb171000068d12e937809fcf8a2c5b3b5e8bcd48873c5c599aff6