Malicious PDF — malware analysis report

Static analysis result for SHA-256 47dc664fb06a5289…

MALICIOUS

PDF

91.3 KB Created: 2021-09-17 14:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 41a4945611e55b2ad4601baf3c08c9f5 SHA-1: c8163ac4724b34da4bbc21a3a7e3d060b97c0e87 SHA-256: 47dc664fb06a52898dede2f330b05172e68140bcb30d8fba799ba81e209636d5
204 Risk Score

Malware Insights

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

This PDF sample contains embedded JavaScript and a high number of links to external URLs, many of which are hosted on disposable domains or compromised WordPress sites. The primary function appears to be a link farm designed to redirect users to malicious content, likely for further malware download or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://chcial.ru/uplcv?utm_term=movie+download+for+free PDF link annotation
    • http://bayernglobal.de/userVZ/file/62589808812.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/47540081870.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/jonamu.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/kirajobefi.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/c7b5bdcb83cf669f7528c46e84e5a34e/65555579701.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/93951790077.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfd7f64176---99411281100.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/56138818940.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16132103ebf4f2---27064282468.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/64486735851.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/43161065474.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614398b869e6f---xofugarovixaluxixoj.pdfIn PDF document text
    • https://bursac.net/userfiles/file/85291143174.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210911_E5934D88B34F50A2.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/2462547ae43e3bafccef3a7cecf3ce1b/suramiviwudawagikararowa.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/rodesut.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/labovizebokopeti.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109081457344946.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/8299f5c3acffc63fb99d654b7dfc0042/sunawuzopasupezidiro.pdfIn PDF document text
    • http://marupi.de/UserFiles/File/xebidatonasofadivusofoger.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/5123253392.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/wukovaluxinenanotekido.pdfIn PDF document text
    • 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_off0001032f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032F 10228 bytes
SHA-256: 058fe3d735a103a0a71313c8768bb3b514bc221e7938d3daf756ce85909cdd26
font_01_sfnt_off00011a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3F 17488 bytes
SHA-256: bb8d637b4f834f3cbacf982e575232179cb39e7d46254de943696bfb603afae4
font_02_sfnt_off000147dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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