Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ab3ad7fcdc4fee…

MALICIOUS

PDF

87.2 KB Created: 2021-07-19 22:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fa1eb8199a2a38e9e809e3bebee9eb42 SHA-1: a2f1e2c271be00c2028b1673871f57709e74e9d4 SHA-256: 23ab3ad7fcdc4fee25e4bc7135ab80c7b0d81ecca8ab2dc875671e7589b1b1b8
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://botosani.ro/img/uploads/file/wofegeropabomufagirorefum.pdf In PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae55c01f01d---papulozixudegiteber.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/u0ti4rtpk6c6usb3qqfeetcu3a/650639933.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/467a720ac20ee1f819e7de8a46b47af9/zorerelijajexibesez.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eba17518e4---90833996757.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/45880564762.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/1t9858rsrmvge6lob75oep1r6h/58928744622.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/nevawufetisuxet.pdfIn PDF document text
    • http://annabarons.lv/files/files/vuvekifikesarixodipavu.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/13316164832.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/72877548712.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bd630a7b261---mepuger.pdfIn PDF document text
    • https://blugarden.eu/file/95480627418.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/2112992207.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac049cc7a08---4957089631.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/65958599374.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072473be5e8e---86614240447.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/tufawudufidisepupu.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/tufafim.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/thjtv33rmujm42f6tkqdk9ilub/bivuja.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869258e1e77---74688072111.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27db549f12---69696026154.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16093b05ae1fb0---64769272879.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/pizawuwovanabi.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/21704190909.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=what+color+do+you+get+when+you+mix+red+green+and+bluePDF 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_off0000eda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA6 11184 bytes
SHA-256: ebdb960cc9a92c4fde57acd828ea6addbf868becff5bcf1500ceba4378cd97f2
font_01_sfnt_off0001077c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077C 18116 bytes
SHA-256: 07e916aedac14a97ab00423fa1905dfe75f51598394cf248d05d7012b40a38bc
font_02_sfnt_off000136d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1