Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13f71b0c7ca02aa…

MALICIOUS

PDF

88.3 KB Created: 2021-09-19 12:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e58f5bc17215f295a6cdf8ccc9cb0be7 SHA-1: 3363849ce99e6f23feb2bb01d11f23efc1767a0b SHA-256: a13f71b0c7ca02aa7f862d0a85b8437a33d87508d30101a7cbd521937c85aa13
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/53bc5d6659e65266501d6cdeb0b679d0/93484226131.pdf In PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/xepuzavusovasupukedov.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/tizulodamaveropa.pdfIn PDF document text
    • http://checopharma.com/upload/files/riluli.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/64987032491.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/95054189189.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/79563888678.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16141c1dc3dfc8---44358912512.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7c0ab2b44---kesumelajepazala.pdfIn PDF document text
    • http://soc-in.com/data/media/files/24599951072.pdfIn PDF document text
    • http://web5gstore.com/Files/files/96966604975.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/13b1804519cfc230bc0bbd1bd03ae60f/bigowadadazize.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/81415008779.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/kusalusenabo.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/63536438859.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/razugenogep.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/xegixamegufape.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/52778057952.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16134375d7fc98---27635549187.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/neroxafowuzufewiwep.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/tikulu.pdfIn PDF document text
    • http://7profi.net/userfiles/file/49143614421.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/bfa540.pdfIn PDF document text
    • http://specimport.by/files/files/linapow.pdfIn PDF document text
    • http://donghotam.com/luutru/files/5557528590.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=android+aktualizacja+aplikacji+tylko+przez+wifiPDF 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_off0000ef6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6C 11008 bytes
SHA-256: 699a3e5b81a7faea247835766d21fe8670a96523a9042f78bcbea30edcb4328a
font_01_sfnt_off00010931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10931 19076 bytes
SHA-256: 934160c3158b2fae44944973d62be92ae4973605f421e42b2c01843b68cbddbb
font_02_sfnt_off0001398b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1398B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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