Malicious PDF — malware analysis report

Static analysis result for SHA-256 185e83610e66a811…

MALICIOUS

PDF

80.3 KB Created: 2021-09-08 07:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f1ac651eb5e219410e07a0adef0ed848 SHA-1: f10ddbd312c745fb8ab3d2409d40fc59da2b5e9a SHA-256: 185e83610e66a8111f3fa8afc862937c2ab8be1d05da196a23aee770cd19a7ed
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL analysis point to a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://garmagostaran.com/Upload/file/derinitimokirok.pdf In PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/dc44f6c3213327405bbbb1000497a20e/sosirov.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/42943737521.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/708014813c658feb274721686f0f89c1/18366309990.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/50566732252.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/sezak.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/33295809080.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/pejufivi.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/rurigokotogarubutufabojiv.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/6727c29c79375b069f6f773bf83a2561/kojuzirunefevemowizanemum.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c0f20faf7---rekiwesolexupi.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/gesadexezupu.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c348dd464---44638342963.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/44135099530.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/59129115276.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/16555426192.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/ligefakoratoboku.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210801164857.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/25864856184.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/rufivelexuti.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/stdnihqq2gdc0pabks6l6f4pj9/9452695009.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/1keu69v8ors7vnffjb1ld88ccq/pifopefiwomatisamuje.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/susezonutovoduro.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b34eb7dca8---73366574359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=go+train+kitchener+line+schedule+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_off0000d7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D3 16608 bytes
SHA-256: 351fd56585d966abdb7f9d4859d2a62c17613b042eea476aafd4a9835d6ef276
font_01_sfnt_off00010272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10272 10948 bytes
SHA-256: 993d39a37052d5828dc1ea6ee645a21d12dc14d95f0c75eaa9be3d1b5fabbe4c
font_02_sfnt_off00011bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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