Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a647ab5d6bcf3a…

MALICIOUS

PDF

76.6 KB Created: 2021-07-23 13:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d58f82003c3018f99fa218a62c945346 SHA-1: d67241a19ae7a5c9b9d49c893c90c04e8a4dfe0f SHA-256: 27a647ab5d6bcf3aa82ecf732404c8df7c0932d5e7fea123d2c36dd15a8bdcbc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised or disposable, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sbox-technology.com/upload/datoteke/85697852502.pdf In PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/mijafuniwedowotidebufo.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/70671687931.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/wuwuputuwubawef.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0246c6916b---xatumadanopu.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885c51c75f6---79162459776.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160865b3e1fdd4---junirowofipu.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/1791601082.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607384aaf357d---bizidaxazedowixozifalugaw.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/3rt6gq5cq1nb3kboedb8mk09a0/joxonomikodozatojuno.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb65aebe54---92684276242.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/14741512295.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c0e07c91f---metobesugezezim.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/tiwotelitakipokixofede.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cfa7d4d0a---wegujolebalujapud.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/5926031963.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4848391d4---14115203230.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/2lkkn3eai4p0ktcc926fq3ipfb/52606945167.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/a1674111bf9b6e696e8591f5dfd4b40b/gutedemi.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/092ae537843bc80ed78889d8c9fa8314/30999552815.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c57b0568df9---78270745311.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa65085609b---tarunagajolonesakogid.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609584da8208c---jujudu.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/71039079155.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/27cbf53de016b1e55f67eff0e7409b01/nusofivivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=primo+bottom+load+self+cleaning+water+dispenser+manualPDF 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_off0000c4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E9 11288 bytes
SHA-256: ab8cad3693757f9bc194b6ec653ed219c75e6df3d3307216806f8de9dd7ca84c
font_01_sfnt_off0000df11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF723 16532 bytes
SHA-256: 55bbdb9a67af6a527ced45247031aee0327675474b55b3feeaf86b789ddae9d9

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