Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f18decaeb687583…

MALICIOUS

PDF

93.4 KB Created: 2021-07-18 14:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7e1c9880500a2a520a38f82dd6a27b6f SHA-1: bbc81fc2946ef68518c79c4911bdb497245f2677 SHA-256: 9f18decaeb687583659a09d603241ac1c0010011578ae8f5828d5fd8deab25c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm, with multiple URLs pointing to potentially compromised websites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using disposable or compromised hosting for these links. While no scripts were directly extracted, the nature of the links suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://tiendanatacion.com/noticias/files/80614536723.pdf In PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/46a5fdf05cc6a31ad50846e9ae2e4b71/84647039150.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/sufizixizivedave.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b4fdd30d0---xewopagidazigazedidom.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/budatawagevov.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/394404f83eaec8e2578bf3548a781841/dapurajamikotukaja.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/doxerumarawelexedijora.pdfIn PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/ratezeparaxegazizuragepo.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/64407178572.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/subefodot.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/34661850009.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/nigudafon.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/nugunepov.pdfIn PDF document text
    • https://gute-reise.ru/i/files/files/rikowolotefebivixeba.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///1857053810.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160735a8cd2261---rerigavukorobodadef.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/pijasez.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607603240e24c---setulagumelupiju.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/gewejibes.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/2fd0abcab5ed028f7f29b935734da0c3/40095361677.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/nokarowexed.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16081348fdcb9d---daguxivotabemafupujuronu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=coin+town+merge+slots+make+money+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF021 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10838 10920 bytes
SHA-256: ec66a6f5df6f4096799b968c75a0f866e384c434071fa8947aeadc4def8a29c6
font_02_sfnt_off00012196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12196 18184 bytes
SHA-256: e797d68d7a8dc29f7a5d53803c2ef8a7cb599a1e6603c1b0231ca8ec5447efb3
font_03_sfnt_off00015088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15088 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516