Malicious PDF — malware analysis report

Static analysis result for SHA-256 db3c1d0dce951fb4…

MALICIOUS

PDF

76.1 KB Created: 2021-07-20 13:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f9ab782c92080d7cfa058812ca7a5417 SHA-1: 9a092070a79772231458fcc7e8c600a922361b4c SHA-256: db3c1d0dce951fb46c65b33ea3d70c3003d7b30fccb772e9ec800ba85c735990
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number for fraudulent purposes, consistent with tech support scams or billing fraud. While no scripts were directly extracted, the presence of numerous links to potentially compromised WordPress upload storage and disposable hosting suggests a phishing or redirection infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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 https://gruntbudowa.pl/files/file/93512738384.pdf In PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/guluwigijapufipidotowav.pdfIn PDF document text
    • http://biomisszio.hu/tmp/geleximu.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d172c0b5b5---junazapipukixuveman.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/28105545440.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/gevapasakomuruteradop.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/werowid.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/sapoxizitaxifuvapal.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a525039ed09---87253285089.pdfIn PDF document text
    • http://aifamilyreunion.com/clients/59202/File/sosapopewasijidovipopen.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a474c8f234e---futiwozajosaxeveboto.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/p6c1hn709f0klnlmk4cqk6g7rl/jitobotizatijeweliwob.pdfIn PDF document text
    • http://targdenunti.ro/userfiles/file/mabajalika.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/79767144054.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/0e3f175a1e472b6d60a9e6ae662959e6/98374429701.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/telagenifos.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/86109276899.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe6dda5761---83811594858.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608540acb2f2a---48858277022.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607588086643a---dijeveru.pdfIn PDF document text
    • http://guchenes.com/d/files/82282925485.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab312395a58---98222385443.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/ropiranivojowijelovatalez.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ad5207b1c---zoxogadulijugukevixurumu.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/xowipawedodemife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=state+and+prove+gauss+bonnet+theoremPDF 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_off0000c844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC844 15928 bytes
SHA-256: dcc4c03c84efd85453fcd2a01ffa0e6657bbb52036aa0dc26f560dfb84d1d18f
font_01_sfnt_off0000f19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19E 11084 bytes
SHA-256: d4e4cb71651a83b87c54b89c72e86288f69fc89f02d699594d122a413f4b2dd3
font_02_sfnt_off00010ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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