Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a0d9e018c780639…

MALICIOUS

PDF

91.6 KB Created: 2021-06-30 15:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d9d6151b0e23ec5ee4f78f7178ea4a2a SHA-1: 7e4f6a20591c975a7fdef9f9e4e67508c734285b SHA-256: 1a0d9e018c7806391b234edab87d50c1cd4ac1b3c88bb005ac66ea3135bfed58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised WordPress sites and other disposable hosting domains. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160883d195dcd5---rulijabedifidaw.pdf In PDF document text
    • https://wagaskar.com/media/44697365720.pdfIn PDF document text
    • http://12shio5.com/contents//files/fobagapuvexet.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabe108be6e---vesibelaxorilojugofo.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/lekowezanaburazebuk.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/d52fc592e56311e2495f2a7ac44cdc08/35076034028.pdfIn PDF document text
    • http://elise.pe/images/file/3118471471.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/5inifnf04eepd5nlb750q3monk/6375499010.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/mulopewediperamexejanud.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/2762bbd091932dc48a39272e69c3b210/48863784228.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/41783200365.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7d69a1fb9---8724830457.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/27532305686.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/159a69aa8305db34e2535bc9869f35cb/59695841520.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160aa401486ae2---razasirapenidaselenuf.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/pvj8afj40p6056702hrnrsq376/joforalejuzozejokigadipi.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/44ea4a81800fa450ae64ab994e33ff49/76898813889.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/55466900651.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be2b876b367---64470947253.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cccedd5ff---85229750996.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/k81m5sssg409sb3ncn8inepmr5/83233930390.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160733f620e32e---20367501922.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c886a7f247---15847022516.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/fjr5kui7jkdp7agadigep9c4t3/sedanasafepubis.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/xuzufozapexajanuzevuzupe.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cd38ac642---kawinomojategarede.pdfIn PDF document text
    • http://terminsk.by/pics/files/34773134210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=codingame+assessment+answersPDF 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_off00010112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10112 10660 bytes
SHA-256: 14172c68e844a4c3149cdcb2d4416ba056e88a7613dfcf2e0c086087c4fed5cb
font_01_sfnt_off00011958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11958 18280 bytes
SHA-256: 820a5ae41d726dd298019edbfb337a57680c1ea7c1dcde5287841377a0f8b782
font_02_sfnt_off0001491a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1491A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1