Malicious PDF — malware analysis report

Static analysis result for SHA-256 182f176770410d09…

MALICIOUS

PDF

105.5 KB Created: 2021-09-06 04:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5a00459033522b85f706d10c387c77cc SHA-1: a4ae3cfc614e196c1c543eaba914c69ec0285163 SHA-256: 182f176770410d0933ae1778ca759eb3074ca2de93cb81aab5f45f58b245edd5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier strongly indicates maliciousness, and the link farm structure suggests an attempt to manipulate search engine results or redirect users to potentially harmful content. No scripts were extracted, but the overall structure and URL analysis point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/d9be2mn2hei4nat381fd51s21v/98735389458.pdf In PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/bct30h81n02rd92tbdmrt8jmpk/60766407622.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebc8f42499---37354924059.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/84432046894.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/sowewazujufuzukudigivova.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/duxomukadafesogosuf.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/2qct9pr1bml7ncjcapa2osm8dp/36100740409.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/kofipugeradefuv.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e335bea685---keguwob.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607f22ad51d76---8584190501.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/kikixetake.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/zapetudagakabopimukaxevod.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161355d42102bf---48687971856.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/hjve1dni8n4nlo82oe6nv1bjo6/53188192712.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/78637967910.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121bfc07706d---33752605188.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/76192419921.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/bolibotukoxugovi.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/27584363886.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e23939eb34---70574538279.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/20443553100.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/44fbdd69298a77cf8535e283dcef75d5/7749324675.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9afdc533ed---pakodavez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=hepatite+virale+e+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000153a0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x153A0 16244 bytes
SHA-256: 9229bde5e3614c940ebb387a6affb910e6b09cdb82f6b0ab59768fbd23138caf
font_00_sfnt_off00011a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A13 23316 bytes
SHA-256: e824d72670df0b95547018b4d82586b50da85565d26996d34427b52e505a8508
font_02_sfnt_off00016991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16991 10156 bytes
SHA-256: 9156819a46d9adb53262eaeab2a117aa64806ce3f18fe8d31f9fed0f648bbfad
font_03_sfnt_off0001805e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1805E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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