Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8751da162dd051…

MALICIOUS

PDF

95.2 KB Created: 2021-07-28 04:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0d15fa4da066476594aa823564328a36 SHA-1: b0aa950544985862d5dec0c2c6a33bc8b0e4f742 SHA-256: 8b8751da162dd0516fc89d5a835bde4933aec60da25c2da3484bb5a73c23d048
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress uploads and disposable hosting. While no scripts were extracted, the structure and embedded URLs suggest a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://elazentrale.de/images/uploaded/file/rimudasimosabuwafovog.pdf In PDF document text
    • https://silky.ae/images/bulk_images/files/82092883058.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/dosilamidolat.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/6b616467b036d4bde071cbea8b5d653f/xazirezakasizuje.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/8826385390.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777afa08804---14424732055.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63be71488f---zevosetugulerezigogovoz.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/72153027555.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d960bab533df20b2ed4a3fc037498e99/16822877708.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/74cf81da2f4d5724c264dd0c31f67b28/63923041575.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/21605691014.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210609_ABD378F2E3AEA8AD.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/20730810364.pdfIn PDF document text
    • http://fotossc.pl/_files/file/pimejasi.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bf796b7202a---54018835321.pdfIn PDF document text
    • http://poorclarescork.ie/images/68682997670.pdfIn PDF document text
    • https://jagominum.com/contents//files/43390384343.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/82375897270.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/43605293926.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfe7266a88---zegixivuguvumiluzijelem.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c69c90bb1c6---wupomimelavef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=%D0%BF%D1%80%D0%B8%D0%BA%D0%BE%D0%BB%D1%8C%D0%BD%D0%BE%D0%B5+%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE+%D0%BF%D0%BE%D0%B7%D0%B4%D1%80%D0%B0%D0%B2%D0%BB%D0%B5%D0%BD%D0%B8%D0%B5+%D1%81+%D0%B4%D0%BD%D0%B5%D0%BC+%D1%80%D0%BE%D0%B6%D0%B4%D0%B5%D0%BD%D0%B8%D1%8F+%D0%BE%D1%82+%D0%B4%D1%80%D1%83%D0%B7%D0%B5%D0%B9PDF 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
font_00_sfnt_off0000edc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC2 20604 bytes
SHA-256: ca028794d2ce5dfd06e51da9d177546aa9022604d6ec9fa0378561a019b3f41f
font_01_sfnt_off0001200b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13822 11400 bytes
SHA-256: 4d87658dfeb8d8ddb3e65038e05a2cbd6bbd2e499d25a7bf7ba60a41cee347eb
font_03_sfnt_off000152a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152A3 16664 bytes
SHA-256: 12252952792ee0704495412d269f0d4ebf02c72139f1f6e1310b4ecb00f08700

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