Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a860def1a14cd28…

MALICIOUS

PDF

76.9 KB Created: 2021-09-05 21:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 32fb5de221fad1755f4d77734f3af568 SHA-1: 1c99a9c88d9c37890bbfccc4b55e47881b8119ec SHA-256: 4a860def1a14cd28102e7c3c656bda6a84740649b5b20559f491e7786f98f781
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16133f3a83dda8---44096923117.pdf In PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/37f640dabb351e81640ffa8621f35540/sezuvagiziwanowujiw.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/todebexoxidi.pdfIn PDF document text
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/nesavavurorit.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/41412582596.pdfIn PDF document text
    • http://aurora-c.jp/files/files/derotewigukafobuzejazovat.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/fakuwukisilerubelij.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/0e3442ea6c397210fb489d2c63ffa9be/rawilevotudisuwu.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160745b655cb50---56398816589.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/17b75cc5fffcfa383dc3b6d2dad341a5/zuzefujakesabagewepafog.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16079008669fb3---vebetizevegulejejoto.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fd3bfd9ec75---67249356844.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/jokuzetul.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/gojuwapowibobaxukeb.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/3292660222.pdfIn PDF document text
    • http://chongros.com/userData/board/file/totobitovinebogu.pdfIn PDF document text
    • https://museos.comarcadelasierradealbarracin.es/ckfinder/userfiles/files/sizikinijasirowajudewox.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e9f6991da---43714163761.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/wujezatixujoropewazinetux.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/xenofo.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/79381255129.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0104000926---gosafaruxevizivukibujebe.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/rarafokisozep.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/25490139756.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086bc5cb800f---jofemef.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/kejipifekozarimoledexum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=afib+guidelines+2014+pdfPDF 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_off0000c7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B4 17596 bytes
SHA-256: 20d0a5b339750934460773b2e926f335bef72f9a4951217214ea0f51753b31d0
font_01_sfnt_off0000f56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56C 10788 bytes
SHA-256: 44a55cba1291606c809ffca696475de2708e95dfc85887fb5a604c98faf605c9
font_02_sfnt_off00010e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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