Malicious PDF — malware analysis report

Static analysis result for SHA-256 963a3fc6f10bb986…

MALICIOUS

PDF

72.5 KB Created: 2021-09-26 12:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c1ed72e7cdffb6f548825c7a52c21f06 SHA-1: 32276c1ed3464573a5dd5e623e53aebb88c81ae7 SHA-256: 963a3fc6f10bb986a933a918bdc7ee78da92a709328ec24fe4c6378716cd852b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document body, though heavily obfuscated, contains embedded URLs and exhibits characteristics of a link farm, suggesting an attempt to redirect users to malicious sites. The 'SE_CALLBACK_LURE' heuristic further indicates a phishing attempt by prompting the user to call a phone number for a fake issue.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.hussco-steel.com/husscofiles/files/tizuteno.pdf In PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/14498334816.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/sirewidogiw.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/66581562197.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/76c8447bbf0b9285b902757ee284de55/51188642666.pdfIn PDF document text
    • https://mar3ol.com/Files/files/nufeparivirusamapumabufe.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c99088a9a8---99054650462.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613244ce1d364---sudilevibafijenurupanazu.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/44886387870.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/36272679913.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/29882567784.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/nivigabagap.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/859e53bpid8kavukgjop9qctc6/defuvizuvazuvikiris.pdfIn PDF document text
    • https://iohrp.org/f_files/files/revagufuxuwokumiwibasol.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/98675959907.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141383014d39---65240723893.pdfIn PDF document text
    • https://eventaipei.com/upload/files/82611726235.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613757fa7c970---31227294779.pdfIn PDF document text
    • http://spynet.gr/Administrator/uploads/userpics/OutPostImages/files/funomegesaz.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135061a7cc17---60519102898.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tidilurelodopam.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/nefadokesegadu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=tamil+new+movies+download+in+tamilrockersPDF 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_off0000b81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB81C 10740 bytes
SHA-256: af12121583eaf0c5a11000e885a1c746978e6ae9e5a2e0f290430ce0ced53c70
font_01_sfnt_off0000d0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EC 16876 bytes
SHA-256: d6d3e1ed1453209881f3562bfb291633cd877f0205370827e523457838161973

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