Malicious PDF — malware analysis report

Static analysis result for SHA-256 33290db0c9dbd5a1…

MALICIOUS

PDF

74.9 KB Created: 2021-08-11 21:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8567997cd46d1700309680407a618fa3 SHA-1: 698baed2112610970ed1829c341dc9d99445e29c SHA-256: 33290db0c9dbd5a196e1022c7855ccd6fd5a514de93f425d0b06cc303b547326
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress sites acting as a link farm. This suggests the document is designed to redirect users to malicious or phishing content. The ML classifier strongly indicated maliciousness, supporting this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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 http://pomodorolennep.de/gfx/userfiles/files/dutegaxobuwapidom.pdf In PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210602154006604343o73s6k.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/43764346531.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f26f7cb9b---xuwarikobara.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/2828ce83c8b374e623c0b232bf589fb2/83531779015.pdfIn PDF document text
    • https://pharmalogindia.in/ckfinder/userfiles/files/fugetofeselozosazafoluj.pdfIn PDF document text
    • http://prosquash.by/data/lowidivagunuz.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/83751897962.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/xokagokovuwikasulu.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/a0mrmuc68155q6958mpq3km613/lekarujufevar.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080862e06183---balonebikemenur.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/17424367790.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160746d8ee0776---53761623259.pdfIn PDF document text
    • http://shesob.com/file/files/rikusate.pdfIn PDF document text
    • https://atlantidegattico.it/file/guwododenuka.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dbba5812d---16105535363.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/17504172129.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609018acb6aea---jevevivid.pdfIn PDF document text
    • https://ovth.ch/userfiles/files/fokunozuvofufebonetosutu.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607704090131a---zexagilujenopep.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/6cho0ftfartjubud5mmaj2025c/gurukisinobubapowupufoxi.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/82694745647.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/kepoxomiroxoloxin.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608054031b90b---29033362351.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9803670dbb---vawugulapug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=simple+html+contact+formPDF 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_off0000c51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC51D 16136 bytes
SHA-256: 7efdad5de4bd47fbed8cc2e4373d9ca172dcdc60a762ec38d49235a5cee762c1
font_01_sfnt_off0000eddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F6 10652 bytes
SHA-256: 11829c47e0843e858a48c2faaccfdba948f91c0ca1f6725b657352d4c250330f

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