Malicious PDF — malware analysis report

Static analysis result for SHA-256 510fc7e9695c9589…

MALICIOUS

PDF

81.3 KB Created: 2021-09-09 05:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d70cd7c0da80e7b03eb43b5d2198e925 SHA-1: 5b6eaa3a9790a957367bfc1ca27a5ea68ca49f27 SHA-256: 510fc7e9695c95892955478290140fe00d569e610828faf5b33f871e911ae302
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a URL with 'recover gmail account' in the UTM term indicates a phishing lure. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://irlanc.ru/uplcv?utm_term=recover+gmail+account+for+android PDF link annotation
    • http://www.arborvitae.cz/ckfinder/userfiles/files/fexinaxosodokukit.pdfIn PDF document text
    • https://campermagazine.tv/public/file/4961649779.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371264ec3e2---53690599344.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/pukufamaxasej.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/38805891808.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/negusolijoja.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613456beedb9f---pafakod.pdfIn PDF document text
    • http://na3.it/misc/file/dikelalagoralajupaxunik.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/nodajukufojafitazokow.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137be90cdfaf---nuxituzepolibuxapef.pdfIn PDF document text
    • https://phuquiland.com/upload/files/sanarukam.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bfb0e9b14---zixal.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/wixubevejonifudufetazeb.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317520eb6a5---93442252223.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/88926058328.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/50631822406.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed3f756a12---regok.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/22078167013.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/fukafawoxamotufidiker.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/86485960036.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325514a2809---24594343705.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/momukufebovefon.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_off0000d90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90C 10864 bytes
SHA-256: 7ece2cc7fd89aec26ff251ad531864d99fb972f3800c5bf370f08896ef6c3173
font_01_sfnt_off0000f1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A07 17524 bytes
SHA-256: 07529f148d743f17b4b7073b21fb84a11127584cde2ef167a6f4b396289d85dc

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