Malicious PDF — malware analysis report

Static analysis result for SHA-256 676c1c4aa3e8753d…

MALICIOUS

PDF

78.7 KB Created: 2021-09-06 08:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0f1b750ac85174954a8d759fb93b1fa5 SHA-1: 85f4177c7489f540d51c11c61e610ebad83adbac SHA-256: 676c1c4aa3e8753d307889c065e41a1dcb8610ae6008467cb224967694788269
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to redirect users to potentially harmful content or exploit kits. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://czdashan.cn/uploadfile/file/2021051512335473499.pdf In PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/fixorasix.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a409879004c---segozuv.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/1db9ad2d426465193073b5b3202251ba/5200565198.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab816da1276---bomojutuvuxurizatuduwawe.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/23739417461.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/51165732136.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/migadunuv.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9635a4038---10406896719.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/68304689877.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958bce2c20d---38153764144.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f856ac481ca---93502712953.pdfIn PDF document text
    • https://rosycaffe.com/file/toxibonikegumapuni.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/0a8c6c2373d64b4ff805961f12963275/33669607139.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/8938382657.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/kuvorivewivolefagad.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/dojofowifov.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202108271534342038.pdfIn PDF document text
    • https://edarky.net/data/file/26752129054.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/dalabamufe.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b580f36c8c6---41307701.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/71225052362.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/80731606335.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fbdaf823925---22893990746.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/b74c46a078e3ec7e5d9dec660571bc5a/36744279917.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=corporate+finance+and+risk+management+pdfPDF 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_off0000d0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D3 11040 bytes
SHA-256: c095256ec26e2820dd3fdc46515c808f8723d999d870b0f8fda30dbb81ee64fc
font_02_sfnt_off00010258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10258 16836 bytes
SHA-256: d98bcfe86b182b50dbee8dae54f6e29b81f654bcde86ddec600c8296e3fdc13c

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