Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ecc86514d836176…

MALICIOUS

PDF

81.8 KB Created: 2021-09-22 15:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3df33e911c69b0a06f4be69b17474a07 SHA-1: 1937635a477e6ea7e496e8952a4c3aba8bad65e0 SHA-256: 4ecc86514d836176d8f7443fc3fb2a01f56902420b535de542d5d2399fac4ace
276 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of phishing and trojan activity. It contains multiple lures, including a browser extension/update installation prompt and a payment redirection scheme, indicating a sophisticated social engineering attempt. The presence of numerous links to potentially compromised WordPress sites and disposable hosting further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://around-sicily.net/userfiles/file/50889486183.pdf In PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/jukaxidezegapuliwefutizip.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/1216982996.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/78209822737.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/24899071787.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/66961820843.pdfIn PDF document text
    • http://zenkatsu.dk/files/46672023232.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/rugotutin.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/batakibibupasesepufi.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d477325fb---37240092278.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/70721779618.pdfIn PDF document text
    • http://devveb.net/userfiles/file/52620046630.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/sabakivirizaxawuteledib.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/zobupaxomokunizazetij.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/61419703122.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/jivuvowuwopasotudu.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0196d5dc7---fasaxewedupavabunuvukoroz.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/lobab.pdfIn PDF document text
    • http://varvshistoriska.com/file/dozegivoxemovulapiwawowit.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/tafogonomalanikum.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/tutaboparesiwu.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/9937b9ad0d9d0056e58e30126b9168b8/52781584659.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614a2ac9361e9---vexukubitufuvoxizo.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/98440770728.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+sync+contacts+to+iphone+from+androidPDF 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_off0000da6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6D 17500 bytes
SHA-256: bec7558ffc0f2d560ea6d82ac937883cebf6158d8eb4fd6b32a6c0534cdda0ad
font_01_sfnt_off000107d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE8 11028 bytes
SHA-256: ca75e37fffb8a78575bea6653649517d018976cb5c6e238fa0320108be096289

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