Malicious PDF — malware analysis report

Static analysis result for SHA-256 3891364dacea91ff…

MALICIOUS

PDF

80.1 KB Created: 2021-08-04 10:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7d0f57815aad86be9b535ab80c9b1a75 SHA-1: 04538047d8a27b208eca046249dfcde75642e9a7 SHA-256: 3891364dacea91ff3625c18ca74a3f9a1396abef9a16de2be4d3ad4e8a687f96
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple external URIs and the nature of the hosting suggest an attempt to distribute malicious content or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16083ce3e7af73---30238764698.pdf In PDF document text
    • http://capmar.eu/userfiles/file/sadigitalugeveb.pdfIn PDF document text
    • https://unosms.us/userfiles/file/gabidi.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/fejusamovevegapirame.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/c5bcac2a513451c27d7a0ac3c8a32076/dabaxuribisurexigolu.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/28411045724.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/797710b22521d4c4e3a42a09263ba898/dixapakopumepalezut.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/36c850cfe50a9ddb7f4e9155537678b3/jivipekilutuxazepefagol.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607025760dd31---53887060234.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/kuzumuzakafasabenu.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160845ddf8712e---74632885306.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/49245a8be196dc24625da1fc02f594d3/13524931822.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160889554e0d77---wurujozenidupil.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/morunolonal.pdfIn PDF document text
    • http://lws-realestate.com/userfiles/files/safadubekomofofubujotez.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c42298ceccd---64547100905.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/vuzojuwonex.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090399dcf2c6---66585592520.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a498879d6c---zazoxe.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/jazowoloxowaxo.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/refirimo.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/8b1c69e245fb7073cab64af96db16e65/zajajuvezufokosinosavi.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/9301730052.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/fediverojerulaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=manual+de+uso+maquina+de+coser+toyota+9800PDF 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_off0000d026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD026 11380 bytes
SHA-256: 7b43574783ddc696e5a2469e9126627632ea313f95df3897dde8649681f5c556
font_01_sfnt_off0000eac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC0 17260 bytes
SHA-256: 052985683f8ae818cdcab254f7b9be3b707ffb9aaa7d4a1ee0d59fefa67e63a4
font_02_sfnt_off00011761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11761 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.