Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb4782f8d105058…

MALICIOUS

PDF

88.4 KB Created: 2021-06-26 01:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 720172fea1fbc4ce55037c034896f5d9 SHA-1: 2f5098cd4bf2f9a1b8928eee5c112b979c938688 SHA-256: 6cb4782f8d1050586e0f8a235f511d0b7bd366d3ef37b7797d60cda61cc0025c
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains malicious content. The document functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. These links are likely intended to host phishing pages or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bookblog.kr/data/file//files/58149678484.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f76926bdc---bixemugezaxanenarewuteti.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/mk2erkphln80mhmrddpsdqlnrf/76202549368.pdf
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/wunixibivugategifu.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/t0g59208gvbqrvfba7lmlg419u/madox.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/ql7renffv6v7mpcqgoi8oi53dp/tokedunopukesavigagane.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc2b163de3---tojelagefiwidaliz.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d83303a3fc---95059438185.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f92948c6b0---67993407682.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805920ca8cb---38298636429.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/1fc8c781e7e4ba324b61b4e8b351cf5f/kosobige.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/cf225755ed3d3c30819ccaefefb3ff2b/42322782324.pdf
    • https://anmimar.com/royal/userfiles/file/vunori.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b817d453b8a---37585866327.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/a7b470efabdd09b9b3391797270f990d/xogukamisunibimiz.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/5l205o3j1jbm1qcplcru9jj206/7828692017.pdf
    • http://benhvienlaptop.biz/userfiles/file/5420842275.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/3e1541a0b0dd67dc2da0f8b03135eb69/rexabutagurufevukus.pdf
    • https://akproauto.com/nbloom/fckuploads/file/dekatamejefupexowozu.pdf
    • http://fine-cottage.ru/userfiles/files/80356165877.pdf
    • http://studiogaleazzo.eu/userfiles/files/bewikuzefuxux.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f8f52dbca---340159132.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/0b8a9e8b0c0909459a866fec048f8d46/pupobetaneteruridudobub.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/f7040f841d144ecfd689842121d6963e/gusonupujipufuz.pdf
    • http://argumentua.com/i/file/seramamatatazipebake.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=good+news+message+example
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2d0.bin
4c5a5961ac56e123fb613286e429818c63903f9773f34801d6225cb3a92cd376		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D0 18048 bytes
font_01_sfnt_off0001223f.bin
60bf4fed9b22ec96677cc57fd5b2477015114e957b250567baf973236a20083e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1223F 10672 bytes
font_02_sfnt_off00013a98.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A98 16792 bytes

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