Malicious PDF — malware analysis report

Static analysis result for SHA-256 b204c5723cdf36bf…

MALICIOUS

PDF

71.8 KB Created: 2021-09-03 10:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 94a358e48a200fe68914dd3e31ec1be3 SHA-1: e33c9849149f529aa1e35c6190e0d1e93c44625d SHA-256: b204c5723cdf36bf6bef0bce0a4e50f5d49567043df6136199b82e8732efe200
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting. These links form a link farm, likely intended to redirect users to phishing or malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=special+relativity+mathematics+pdf PDF link annotation
    • https://baigiangtoanhoc.com/upload/files/lazemewabumo.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f349b4344d---92211528904.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/34645323797.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/tudiviwad.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/86913331458.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/sugolowir.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/88939523722.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/tikowinorofisivinesuro.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/tavugarelipafiwuvim.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/47355752254.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5fadb56d4---84493820712.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdfbf95c5e3---82274438899.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d30d159c2d9---22333229727.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/tuwurululiton.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/bbf22fb82754cbc8a118739cb92c05d6/xubarifidejedejo.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ea9c98b5c---19335819946.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c528849607d---rovejopemuf.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/37667171154.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/f214b11201a69fe4000a1fbb3d689e14/katesevatipororexa.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/8d2bcba7b66fa412da25857729eb27cd/69989370647.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/72525347642.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/43864436668.pdfIn PDF document text
    • https://parkettworld.com/upload/files/36626033544.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b4b7ec9c4---lozuxojatil.pdfIn PDF document text
    • https://magatek.com/documents/file/5971209931.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/kilenafogomita.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210810124559_gwkw62.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_off0000b902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB902 15412 bytes
SHA-256: 6e4581c24ed3f6983023f9010df3eee4f009d1b990c13194c6c95a9deec7cc3f
font_01_sfnt_off0000e031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE031 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF848 10916 bytes
SHA-256: 090fdbb64ea321a4f096383d6f22238c6b417945b681f5d59671453a61fe2201

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