Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d03dba2142114f6…

MALICIOUS

PDF

84.1 KB Created: 2021-09-05 11:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 520e38c5e6e05b4d77e12fd410134686 SHA-1: 308ee359968ac40b76f095a7e3382e553fc0c7e5 SHA-256: 4d03dba2142114f6334c267b0a320d3ed2e34af0e44c37fa8fde3011d8de8411
104 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to compromised CMS upload directories, suggesting an attempt to host and distribute malicious files. The presence of a visual download button further supports a social engineering lure. The ML classifier strongly indicated maliciousness, and the overall structure points to a link farm designed to trick users into downloading potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=mtg+fingertips+book+pdf+free+download PDF link annotation
    • http://exantusfamilyreunion.com/clients/9/96/968554593547eb574606130639276270/File/romolimajaxutomupim.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/3b799e15b529cdafb5a1d6bd39810236/84008306874.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/44512215613.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/59904333897.pdfIn PDF document text
    • http://idroter.org/userfiles/files/dasemutazujodan.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/sazepokosolabiwe.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/bonelikemewutojujus.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/85237825427.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/31518019180.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161316e0d533a4---79654535709.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/perisabejegibutupuwo.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a0b8ca599b---17290975521.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/5641747570.pdfIn PDF document text
    • http://anpo.vn/upload/files/90658416136.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/55780551570.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/2045d7cb95a1d3f727f3818c1c657519/fedewomubepexe.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/gakebowowononuzenuluwa.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/diwuwekudakuwowugazefure.pdfIn PDF document text
    • http://coolscape.info/images/files/27542340251.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/1gf87ub2ca1l8bi3k28q2t2eug/57299222256.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/21715201650.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/gojugefuxuvaxum.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/wurakifiwijomawux.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/54817733667.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_off0000ddf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF607 19780 bytes
SHA-256: 48fde35d737f328b67acbdf842c15dbf93c33fea825282f4ae13bf9643eb4952
font_02_sfnt_off000129a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A8 10984 bytes
SHA-256: b97ad843e7ec68f83d5d82f464a450d6f7259265ac600eef203c69f0c76f2b43