Malicious PDF — malware analysis report

Static analysis result for SHA-256 549a0faa8b5fbf91…

MALICIOUS

PDF

71.2 KB Created: 2021-09-09 05:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 49cb7371c0a049a7c2bc5b409329775c SHA-1: 594d47ca371014a9035dccf3b3749fa20b341ae9 SHA-256: 549a0faa8b5fbf91ca00f98fad1827877d8bc13d525e4ac110a4dcf0b0eeb130
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised WordPress sites hosting further PDF files. The presence of a 'download button' heuristic and the ML classifier's high confidence score suggest a malicious intent to trick the user into downloading a payload. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/f1f867574304526af62a063bc128cf3b/jizadan.pdf In PDF document text
    • http://labuchedeberce.fr/userfiles/file/91021790916.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/sowara.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/bomidaritad.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/wexuwowawikizix.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/pupevadasadapobawafobuno.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/ninovova.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/56697613686.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/purulowomug.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135c6ee3e222---98985677529.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/vivimomawoweludexebu.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/gavan.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/48585925392.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/gatoto.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/41554177241.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613011474078c---finuzez.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109051352495052.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161352c9f270db---manivojabuwokodafokumole.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392ae0a4518---gugivawodesadaruti.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/6ep5djjmchj3b08t16s8pbd6oq/24382780047.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/58621703966.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/bemoxoxodesajulexevo.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/jekorajo.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/23174424957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=new+movie+2019+torrent+magnetPDF 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_off0000b428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB428 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3A 16476 bytes
SHA-256: 7a05324f95be0a8e3f6d561a23c09142f542ce867973b8fe80ed30d52501e255
font_02_sfnt_off0000f677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF677 10828 bytes
SHA-256: 43577eac7dd66311ec517c75a5d86240b2bec2ab3a01795efc40eaca39d98623

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