Malicious PDF — malware analysis report

Static analysis result for SHA-256 773c90d2c05a6aa1…

MALICIOUS

PDF

86.6 KB Created: 2021-06-25 23:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b75b83ad9856d9933d74bc9252c793c SHA-1: 1a3f5e0459f295833cb778204a9ec5f7d3c861e6 SHA-256: 773c90d2c05a6aa157aeb9f6814c240acc9d5b989a8b8d51a01690f960ac190a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting domains. The primary purpose appears to be SEO manipulation or directing users to potentially harmful content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://zamokugrofa.sk/admin/fckeditor/file/26648176111.pdf
    • https://siroyensao.com/upload/files/83170156158.pdf
    • http://rund.cz/UserFiles/File/bilipomajifenunixasibos.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076ada56c599---59132314023.pdf
    • http://ibtaker.ps/userfiles/file/96476871026.pdf
    • http://4bx.pl/public/file/xinuzapisimovu.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16086ec4084888---ditogemevolipolas.pdf
    • http://stellamaris.cz/userfiles/nivokilinoxukajikuvanawo.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/9ca27560d02be141d26952e6ad45f357/91302680786.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e80093d3d7---40546640635.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0d441680---89658018242.pdf
    • https://ayurvedaemart.com/uploads/file/jevajiloxanik.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088ecb25dd0d---sibarar.pdf
    • http://reicar.dk/userfiles/file/wuvatezurip.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/6nv8hjkqt7f4k9if1fi94lgh6j/28372148810.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160965156a782a---nejepirosavute.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6f1f3d500---gupopuxifur.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3de6741b2---14954625720.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16084332432cff---bazepavaxuseporubinaxet.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a457349a35a---favozamizegekugevedim.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077715db2139---koganajanopop.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16086e71cccbff---pegogawiri.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/59befcbbe41929fa367adac79a2d75ca/93092626690.pdf
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65650638667.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16088bf46cd186---jalapiliromogutedafili.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/76f450aa115d021c261b32938972da9c/39863838090.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=example+of+pinacol+pinacolone+rearrangement
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef1a.bin
e8a51999711ace2881103f5a54ebbdaad9bffd2282aeb95e005fc504e313b3f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1A 17612 bytes
font_01_sfnt_off00011c29.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C29 16792 bytes
font_02_sfnt_off00013440.bin
698d610868ed5406592cb329a90018cfb319c323126cfe61e615bf2c70ac1455		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13440 10740 bytes

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