Malicious PDF — malware analysis report

Static analysis result for SHA-256 0439f0ed948e221f…

MALICIOUS

PDF

88.7 KB Created: 2021-08-13 06:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2f189496312ed3c6e1d6370c9506abf6 SHA-1: 26a2596818e0ad8bb329cc5276aac9c1582f82ae SHA-256: 0439f0ed948e221f52b9c3994a499af8c7f97b7605dc3530959e760ea5c484a1
104 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, supported by heuristics identifying the PDF as a link farm pointing to compromised CMS uploads. The document body is unreadable, but the presence of numerous external links, many on disposable hosting, suggests a phishing or malware distribution attempt. The sample likely serves as a lure to direct users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://glamour-nsk.ru/ckfinder/userfiles/files/50948959575.pdf In PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a252c13a6---75362827319.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/n3nes0hq99jm42f3p2mtpp4r8f/gekexovedi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e8ca254cef5---98227920370.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/93887284855.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/vozaguviwufuwegu.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/tejawowowepus.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f25c76f901---79692762472.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/wukefavuvimu.pdfIn PDF document text
    • http://martonelektro.hu/files/file/vuxomipeba.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/rebinuvetajevarovufafok.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/73642338589.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/92248550138.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/12284251ae99799edd9bb6e3f0297514/tafamax.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f934fc3086---74770219034.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ec16d5bf2---69157587793.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd56c0a300e---38033724730.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e613465e807---sevilejudige.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/vebaxotimopekiw.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/nigofofutukefukezolo.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e414d760579---mexilu.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/25147248535.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/nubodiwumijew.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/dejuduviniluwujezutepazas.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/metujebofuserilekitodale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=itransmission+ipa+ios+12PDF 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_off0000f7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E5 10360 bytes
SHA-256: fef896e53fa0f63abb6c3ea1dd35f6a9b32bf1e068eae0d3d247c230ec3db6ee
font_01_sfnt_off00010f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12769 17312 bytes
SHA-256: 2f70f48222ca1bf23d9b4603d9efd81e2474ddcf5bffbd47fba47239d1313621

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