Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b6a790aab321fb…

MALICIOUS

PDF

70.5 KB Created: 2021-09-28 12:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1aa7bdffbaca2ea184bfeacab35d4a65 SHA-1: 4715fbb18573752f3621b1260e7e9542e5403ef5 SHA-256: b8b6a790aab321fb242cc73cb9ff4061a7cc1b030b4a2d846a7096f7fcfe253f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file that contains embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a link farm pointing to various domains, some of which are hosted on compromised WordPress sites, suggesting an attempt to lure users to malicious destinations. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.juniorcollege.cl/ckfinder/userfiles/files/63661309516.pdf In PDF document text
    • https://panelshock.com/userfiles/file/53142755671.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/32619509012.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc58a53a80---50157583838.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/pojufetimako.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/51248058600.pdfIn PDF document text
    • http://montazenabytkupraha.cz/files/file/jivoko.pdfIn PDF document text
    • http://findacommodity.com/upload/file/zuvenimomuxurolovijupu.pdfIn PDF document text
    • http://domuran.pl/files/file/50734378720.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/supodesu.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/sezexupufitejewofiko.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/53737598751.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/lagevobirekodujiw.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/gewepapojokozotu.pdfIn PDF document text
    • https://bawauang.com/contents/files/vasosiwusafanuzugu.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/20537569751.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/61807813498.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614da94bd5d53---nitajidamaruwapowageb.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/fesexaxomufularevov.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401edea4d93---womofiju.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614aee4140c18---wudonirakamosasa.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/nijusalofoz.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/9700357621.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/mujetulevajataved.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=g531f+frp+filePDF 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_off0000b370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB370 10096 bytes
SHA-256: d3f0709090ae656b5462fc8c33f18117837b914608d97f90ad15b833484ea070
font_01_sfnt_off0000ca0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0C 16464 bytes
SHA-256: 91dfddbff9d849ee626eb22d54752cc4947a081b3e18a76521be834d9727cfe3
font_02_sfnt_off0000f48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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