Malicious PDF — malware analysis report

Static analysis result for SHA-256 684152edfce5b945…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 05:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 875ce28abedc7cd8538b4c7cef402d4f SHA-1: dcfd7a7276063a9264aa55cb6489089f4998549e SHA-256: 684152edfce5b945fb243166032f0a494ba9d6870ab7f5a281019aed6474b595
104 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of a 'download button' heuristic further supports a malicious intent. The primary goal appears to be tricking users into clicking links that lead to malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=samsung+pc+suite+for+pc+free+download PDF link annotation
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3c1708805---73296410889.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ghhgp4dn79si0ak5epdvgqkapq/75108466130.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/tesifelexaneridut.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/71014537258.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/dolapaf.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/29072545888.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135cead5d950---58368295026.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/5900a2428d6ab5f0d6c49870b8fa8154/buponuxeredivamowas.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/15945903794.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161402136103f0---wisudevudir.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/11276761928.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/dagumowagum.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/7e3804685d65e500f7bb9e40897cc51c/kuxopupewimenatejajax.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/supafalerer.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/jugewojafiterisasikegipe.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413e447eaf5---14546404824.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/tunorirujis.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/jirowimeg.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/bepuxakewowekew.pdfIn PDF document text
    • http://mega.kz/media/upload/files/merodatijuvefatapara.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/noxaxuf.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/7517613876.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_off0000d90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90D 18244 bytes
SHA-256: 9e23caa4a47d46012b8238b8527c7e35b44f5ce215344d60ecb1d2abe5266e35
font_01_sfnt_off000108e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E2 11224 bytes
SHA-256: 31689c7d72ea2727873c97cc4af000a1e856226cffec00778ffafb4209af8809
font_02_sfnt_off00012305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12305 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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