Malicious PDF — malware analysis report

Static analysis result for SHA-256 6097f47f09cb2a0a…

MALICIOUS

PDF

87.2 KB Created: 2021-09-02 06:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f00e6268bf53e8beb67fa529e4e7f83a SHA-1: 1622167f8edb482956ff5375fcaa195994832402 SHA-256: 6097f47f09cb2a0aa31cc7ffa6bdbb1453dc55ed1e94ca5a09155adbec4809c7
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm, with many distinct hosts and links pointing to compromised CMS upload directories. The ML classifier and ClamAV also strongly indicated maliciousness. The file's purpose appears to be directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdc4c5ca82---70650071154.pdf In PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a192580966a---71086995554.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/pqq5h66aq0ovm49crvrmp062i5/wupakixu.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/67618802493.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/f9fe6987bd4fa0fe97d03078a469ed7f/64849293164.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/14013557689.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835f37bbbdd---gagajuxaberebiriluk.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/94662903703.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/11b9370508943ece1e55d120bcf163b0/vagisuzisegutimodakeleve.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8397490fb---51571454414.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/delutu.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/zegeliwajojojitisibifaxi.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803ee85269b---zosavov.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/tn62vu2vff99jgoe0sspbn7p20/zusovokisepiba.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/38306500803.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091b64bd799b---somekiparaxidojolokipam.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/pusofodizo.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/2989960033.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a311dc3b1647846b341cbb74a6946ff6/23090452097.pdfIn PDF document text
    • http://bougerpourstarlight.com/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/luvexadex.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/83858356242.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/vugaxejetara.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/36048238790.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/cdc8e19f35f26a8bf47b9eb605024177/bixulapitudigax.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/gobufaruzarere.pdfIn PDF document text
    • http://www.fotoliIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=online+text+with+strangersPDF 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_off0000eee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F2 17856 bytes
SHA-256: f017e2dfa84eafce95314ba3bdf4b1c42ad33857c3753c39b48340b25992693b
font_02_sfnt_off00013519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13519 10480 bytes
SHA-256: 9ab9faa83f6cad0f0fae2e18c8e18db1b80e9cca2753f42e1a0987141b33eab3