Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b8c7a864faeb5b…

MALICIOUS

PDF

82.4 KB Created: 2021-09-11 08:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fbcdfcb0a64c99efa5c6f2a1cfcf7062 SHA-1: 9e9dcfac5d31505e3834a718a3fd529a4912bb8e SHA-256: b7b8c7a864faeb5bf99b9f1b936e2acd31d38b56f6b4207bde4b22de60e59a25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/263606cfa4355171486999bae7b634f2/rezorapizewatijilune.pdf In PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/352dbf2504e313d5cbf30835b4eef8a2/zoxadebosavud.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/padakubemek.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/74567021723.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/4716027318.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/guwanodituzifodijal.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9d6dd881e---bilamumiz.pdfIn PDF document text
    • http://halmar.info/userfiles/file/57744389014.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/24770406659.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/jokizanepiguno.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210908021746.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/rufojixaladixenoke.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/rubudalunavavobarexal.pdfIn PDF document text
    • http://millecolori.it/images/file/37848411397.pdfIn PDF document text
    • http://vinhosnorte.com/images/files/53696735038.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/96657054696.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/zeziletos.pdfIn PDF document text
    • https://khanikango.in/file/sutejoxomefodifomemeg.pdfIn PDF document text
    • https://faceless.me/userfiles/files/lobojefelapolikumo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364b680bb62---fabemoverase.pdfIn PDF document text
    • http://snsi.jp/image/news_file/lejajawelutupoz.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/pokumetiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=invisible+chat+messengerPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135583f9146e---davebutezejupefobuxup.pdfIn 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://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_off0000de57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE57 17400 bytes
SHA-256: 764e71e4c98e1d054b5d86b342c6fd8fb1da30c21428a799430260a494350fa7
font_01_sfnt_off00010b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12392 10712 bytes
SHA-256: ed6f06500e353cc1a8c7c71d32ec68155ce49ec3f05d9f94fb6ab00613674461

Open this report in the interactive analyzer, or submit your own file for analysis.