Malicious PDF — malware analysis report

Static analysis result for SHA-256 048dc26fb37fd127…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 01:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5be1fd31cb8ef265abe7ebe9e99cf9b6 SHA-1: 8c88ac8ed7e712f9ac178c96bbe45686d9187232 SHA-256: 048dc26fb37fd1270a1d7339609154ae0bf58ebba5a35be659110d317657c90d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=idbs+simulator+bus+lintas+sumatera+mod+apk PDF link annotation
    • http://songhandiban.com/uploadfile/file/2021091517382773499.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/3367136279.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/xafalolafidegemusazufisaj.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/labupusajuxetutozax.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346c19ddba4---jedojikilag.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/lariwifupunazogas.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/fukutabivasipisireb.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/meguzidabeza.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/jizijewolebarazevelamu.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///27772830920.pdfIn PDF document text
    • http://medrea.ru/upload/files/mewevanalibutu.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/62268280428.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/042102481662.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090214081258231.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/42647519700.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/6202b5ea1d7bec4752c6fe7fc03c8e5d/lazobopuba.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/37844267467.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/6430442ce9987d41390d4aefcb1a3b0c/wuxivoxivigijo.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/39137953098.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/68211305070.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/jaseze.pdfIn PDF document text
    • http://fitviewer.com/files/file/77698113791.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/gaxugaxebasiwifopoz.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/f2706278e373150f8d6c8b36f5a55770/57913506830.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/64127852937.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/36752892503.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/jegogej.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_off0000d56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED82 10836 bytes
SHA-256: 9fed84bfb91e21599bb2b2f516856caad6386ce94da8adb222a59638e37dc624
font_02_sfnt_off0001063f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063F 18108 bytes
SHA-256: 32a9d4b0f5b84b6e27d200cbf75ec0834af1cde824403911e3611e76e5d12283