Malicious PDF — malware analysis report

Static analysis result for SHA-256 b84aa29410e6c22a…

MALICIOUS

PDF

82.0 KB Created: 2021-09-06 21:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7bed9f9be0bfd52cff0137dc81fd04d7 SHA-1: f69dc27fb53c4ef381128ecca6f0520330d8efdd SHA-256: b84aa29410e6c22ae5a72a1e2f15000e261c82d6b75b2e0ec3bcf9d003a87ea2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV and an ML classifier as malicious, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

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 http://fsoa.cn/userfiles/file/89994049492.pdf In PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160830d7d54439---86104124214.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/63714485308.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/99550772084.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/xokokifam.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/21081512504720812834hnp.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/davemifuxemired.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/42374757273.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf7e6784c---xipuruzez.pdfIn PDF document text
    • http://actinq.nl/upload/file/ximozaxaxilenarixirowafo.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/70856137f551b250f6c87fa601826a89/kaxizudanozesukatasowode.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/93416833410.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/91505848276.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc1c5c62e6---22817251960.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1612920aebbb14---27348094947.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/sesoguxerazilodotog.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/so6hnu1js3hv6c9s7pfaqureea/nunovimadebosov.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091fc9f2c455---57526501656.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/dubijunaboguwukomanimifek.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/09qvsg1ftcn6i4f512v92fa97r/visutapexitijotikipo.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af10345f4a---pudefilujo.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f71a59997f---14606021282.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=fourth+grade+sight+words+list+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c95e1520c---nunorowotazomov.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_off0000da4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4C 18396 bytes
SHA-256: cc34d15f47252f5d87d60820b18b95f267277ddcd440e90fa3bf021c3cf983bb
font_01_sfnt_off0001090c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090C 10836 bytes
SHA-256: aa81890f19cd8d6d24f099fdda06d7ca172ca0d0b20efe75db36fca803558fc5
font_02_sfnt_off0001220f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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