Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f9f84b2ce482c3d…

MALICIOUS

PDF

71.3 KB Created: 2021-09-17 15:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d6c76355468b638c4714a44a0ade39aa SHA-1: bc2ac10da268dd8a2ed886ce1951622c449d6284 SHA-256: 1f9f84b2ce482c3d5b5f003911f44fba20f7ca908ea141224f92f7e591149723
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The PDF also functions as a link farm, pointing to numerous external URLs hosted on potentially compromised or disposable domains. These factors, combined with ClamAV detection and ML classification, strongly indicate a malicious intent, likely for phishing or distributing further malware.

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 https://shirbandifelt.com/userfiles/file/43286034289.pdf In PDF document text
    • https://qigoodteam.com/uploads/files/202109031153293297.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/rexonovaraletukof.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/kanuradilenebalat.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/e17523d60df2318f874323a83e755650/42389372317.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ccm2bu54rj4r0ct3fe0drrt2c1/nedosezisajubugogub.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/58845584202.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/14399442567.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b07534b2e9---sufefatojudige.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/55012395046.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/63240995153.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135e4370a212---wuzotakojatolebopivoraz.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/b652b7ec48a3acc0bc1241dffda3b331/mogad.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/fupozopunobelibikekax.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/gomuguko.pdfIn PDF document text
    • http://vtaky.sk/media/file/75119543022.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec50fe92c7---fikolewagovawelefimesago.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/bifawo.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/tebakivigutotipomuguge.pdfIn PDF document text
    • http://ggbris.com/slbdavbatala/userfiles/file/gekuwezomidukusolika.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/sopalugasuzovokemorema.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/14323748235.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/gixasopixijinakubi.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd3c8ef5b8---10287887185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=alien+drive+me+crazy+mod+appPDF 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_off0000b744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB744 15580 bytes
SHA-256: ba6601075eb0ea38dd14f645c8ec336096040a74d8c7f5302afd4273a4caaf1c
font_01_sfnt_off0000df3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3D 10628 bytes
SHA-256: 96e52634acb508eee58d56d491e0e1ecb8fb39eb3688baffaf8718b8862928a9
font_02_sfnt_off0000f790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF790 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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