Malicious PDF — malware analysis report

Static analysis result for SHA-256 06877b728cffa005…

MALICIOUS

PDF

84.6 KB Created: 2021-07-09 10:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 74e4074fc73aecd0b1424828fbce616c SHA-1: 9b04547e60e6943d37329500a63ecc3be6a4e503 SHA-256: 06877b728cffa005c89fd39776990ab748ca7fb3ab3ed9dbd043b38a0876779a
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or conduct phishing. The embedded JavaScript likely facilitates the redirection or execution of malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/f7ar1jtk95jp8hppvamj2j6aa8/25094322219.pdf In PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de5e1142593---85592400918.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/239903327.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/25751616235.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a74860862b7---miriluzibibefozerigelobo.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/93180153170.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/piwazerok.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/gilurirur.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/63118630513.pdfIn PDF document text
    • https://activepymes.com/pub/file/lujatefufazitekelavaki.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/58321688686.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/50483957920.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/d7778bc22aa7b541c9e107220829a7cb/4618232147.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/sukonivadinut.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/ef0808663dea8212db7521bf830e3bec/mamukijodasalizog.pdfIn PDF document text
    • http://berrybucs1973.com/clients/3/3a/3a2d6910be1067feaf6dc79f90d505e0/File/4231119000.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160829f98b9c06---ridulipi.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/josejaxe.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/4de84d78bac22f0a99841bb340795959/92796029879.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/80ca596d348f78f673588559a3ef41df/99387206217.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160bd12c9c9764---buxakadosije.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/30221204342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=authorization+letter+to+claim+nso+birth+certificatePDF 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_off0000e6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EF 17000 bytes
SHA-256: 7aa632aced21923296ba9e6ea44e7756b05618ed5a4d3d9205a362629dddd0b5
font_01_sfnt_off0001137a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B91 10880 bytes
SHA-256: eba25ee2670ef92efe182bf8df974e070d731337c512d11a72c858a108d3074d

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