Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbbead79876c3aa3…

MALICIOUS

PDF

98.7 KB Created: 2021-09-01 01:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6a1523c9680e6df41f3a529334a6bcaf SHA-1: 5bcd918c8eb1a2bbfe9ef0eed13007ed518c5ba7 SHA-256: fbbead79876c3aa3411328af36ed0a2b4b1f2b2176e4172cbaca3f55ae123a4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristics and URL analysis point to the document's purpose being to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://centralcogtc.com/uploads/file/37960473362.pdf In PDF document text
    • https://shian-jin.com/UserFiles/files/41616907093.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/21759002836b068b6dac0826530855f0/76343461610.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/sowowoxifumegexazabivitik.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/94697336612.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160bad91e7fd31---xumiref.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609877cf999dd---jamalilutanevilafarejujuf.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/barebatutade.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/totijilabugumabeladeveso.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9150abd494b1f782fae5c2c97dc55326/finilezo.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/007317cfca58b6d4642de76437aa0197/nebavidavineleluzibuwuj.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/37a35300f8734b8e178cfb79083b9e6a/gaxuxemixurimopik.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d140c57c06---77498707342.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/f5n33nfjhcakosaak9cnrbqnht/57868261761.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161156695618d3---362268092.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/upumc9p5efq414a3iraf7qu692/kejuxupiru.pdfIn PDF document text
    • https://binhvi.com/upload/files/47597960012.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/67220478536.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f920641ff7---daxorakovufakatizor.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/2075986084.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/37390720164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=thin+film+interference+problems+and+solutions+pdfPDF 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_off0001172e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F45 11088 bytes
SHA-256: 4887e81cf7e9f333adebb15a96c7135aec608f77c51526481e4ca4a38b676e21
font_02_sfnt_off000148a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148A3 19584 bytes
SHA-256: 4e61463aaff1f26ee52968961ce086d6ee2858a648338ded212e6a9b41ab02c4

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