Malicious PDF — malware analysis report

Static analysis result for SHA-256 c03b4a4963853afc…

MALICIOUS

PDF

82.5 KB Created: 2021-09-03 22:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9563bcab13be341cdf1cd191a839e38d SHA-1: 96b3ef084a1d3040a7f797f89f084755d22d5cbb SHA-256: c03b4a4963853afce3845b9ea5241c6f05e2d717c3231a59d7f427d960c81c13
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious content. It contains numerous embedded URIs, with several pointing to potentially compromised websites or directly to IP addresses, suggesting a phishing or malware distribution attempt. The presence of links to compromised CMS uploads and disposable hosting further supports this. No scripts were extracted, but the overall structure and URI findings point to a malicious link-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/mosemufiniwumovu.pdf In PDF document text
    • http://guides2alpes.fr/uploads/file/7170516541.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/c349f4cb3b96880f7d6fa229eccb8e14/74698695595.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e925d058e---86797361808.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/naridal.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f1e685541---gibadijube.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ea4b67e11---womozizof.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/18598946736.pdfIn PDF document text
    • https://vieclambanhang247.com/upload/files/48635467337.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/12174801062.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/fudivotuxisotalid.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/89781907466.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1511986634.pdfIn PDF document text
    • http://hoggard1975.com/clients/a/a4/a43fc1111b7ad4318f8b553feb79a890/File/xoxosikikedigunegerogeru.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/60465592783.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/38204288252.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/805f1a7db465448848d93ac1a38d6c34/wilujakajuninak.pdfIn PDF document text
    • http://autofulltravel.com/userfiles/files/ziminigerufurasikano.pdfIn PDF document text
    • http://rykatd.com/files/95090977605.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/girafakituleraso.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/8flntpggtko41jo28dfpi9me1k/tepapagiduporatowija.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/zexelimivasofavipevaradu.pdfPDF link annotation
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/a067a334d1229865d38321cbfd4bf044/mafamoduguvodajunufame.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/dafogonikuzexupa.pdfIn PDF document text
    • https://irrisyst.eu/files/file/11556698696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=opposites+worksheets+for+kindergartenPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/63832809179.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_off0000db98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB98 18152 bytes
SHA-256: d080270ce85435e1d80d9a95c86053078b52d144c5bb988e7f458bdd136e5341
font_01_sfnt_off00010a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8C 10936 bytes
SHA-256: b7444acc952b5adc23a56420881f585ead2234ef9210ac4ff1b6ea0f2a3cccf4
font_02_sfnt_off000123c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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