Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e0f1426feaf1d4…

MALICIOUS

PDF

72.6 KB Created: 2021-09-06 09:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a61931c7614268dff8482c4f4c01296e SHA-1: 17d22508c3f9ec64aa1d5e8a493b3787f6666fba SHA-256: 52e0f1426feaf1d47ceefc2c850a908ed2c1551aa9db4fd1b007a33bc4a8e014
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm for SEO manipulation or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. No scripts were extracted, but the structure and URL distribution are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 5

  • 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://infrive.ru/uplcv?utm_term=parikh+medical+jurisprudence+pdf PDF link annotation
    • https://hiroyoung.com/data/files/95034337428.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/zenaxidemafowonipefaw.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/gobiliromikakogop.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/25599331728.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cb6e67f29---rafubegabireganawad.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/50313886055.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/gevoxinirotidiralilu.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160e40a7348996---13120833351.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/rulelofowemirinir.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964adb79a0d---95120655037.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/33770842153.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/6f234a8d035929ca99ee96a88aef87f9/3496985059.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/51850364332.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098fb0ce9abb---59211167837.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/60835359139.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/44586746179.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/97819911092.pdfIn PDF document text
    • https://kawanmto.com/contents//files/fojovulatedinoka.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/27872966421.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/gg7s5uc3o0c3mbp5dli92baipi/66738531969.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/duxusetowuxi.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52b547300---nabekepupi.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/32334845215.pdfIn PDF document text
    • http://mega.kz/media/upload/files/tagabof.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6b505a1fd9b0546a76d3ca1d08b79674/pujajazeg.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/davatubunelaxise.pdfIn PDF document text
    • 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_off0000be63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD675 14528 bytes
SHA-256: 6985274dd798994d4670029e0c4888c9c1e40f35eae04ee1b583f4f9d54b23c4
font_02_sfnt_off0000fb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB45 10988 bytes
SHA-256: e829b16683754c459367ccbd823c4681c8d09abb6b8b4b19889db7bd6372251f