Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d141f63779ccc5a…

MALICIOUS

PDF

84.1 KB Created: 2021-07-04 13:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7843bbfd2a5bbfefb40c606c77c611df SHA-1: 944ed8833dec76062e9218866df5646496643d55 SHA-256: 6d141f63779ccc5a63aa74d534cf76f53f6e5837387786d41198500aa43cd425
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://crewmak.ru/uplcv?utm_term=all+about+transformer+pdf PDF link annotation
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/3826067007.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/31a9e52ba2f2fdca8ef744d990c54b40/kununigakosibikumefis.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/20e322466f3dd6581c327d827f4153c0/90942496576.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/3bb64d90dc90795254467742897ddaa7/88718647607.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/55006979154.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c5c77de65---47629263016.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dababf90398---dinewajomolilomubimi.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085155f6a0f8---zugelojudarigil.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608124ba9371f---rekazilafoxelexalogin.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/xudidetim.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/73b75378d9ace5b46b20c2a6bf4aef10/66876531407.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/1ee1be7ee31192de83bf12fa1328c041/23790063703.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/36m9hig3v16s8amoktt0a4a7qc/jagiwapuvolid.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8ko8p9ghulmbcp9o3unu8pg4s5/46875642259.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/wevobaxurimurareta.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/rokufidofuxewesazojar.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdec49e6b12---74887364960.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/843159686.pdfIn PDF document text
    • https://windsbs.biz/files/file/tenamawefaparukofawapu.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9877d8a08---48333983390.pdfIn PDF document text
    • https://aspirans.com/files/file/78650478052.pdfIn PDF document text
    • http://congtyvima.com/images/Download/famuwivogudadefiwefafujuj.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/53b8a92bc93425c00c666cd9989b9d6b/ramifuwupatonotal.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25545a61bd---3741622681.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69B 16824 bytes
SHA-256: 7c00ea6b88e13ffde4bdc7a54b887f9ac5678e06990f78592e8b5704d335ebae
font_01_sfnt_off0001126b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126B 10788 bytes
SHA-256: be02b75a26267f6579ae0fa0e2a6250cc3d52b8a4cd2f189549e30bbcafc1d17
font_02_sfnt_off00012b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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