Malicious PDF — malware analysis report

Static analysis result for SHA-256 800a034c424fc499…

MALICIOUS

PDF

79.5 KB Created: 2021-09-04 12:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: e0d07a586903e0ef0ed90cf68d22c570 SHA-1: 084a71fdb6f7920eaf9ed57a704ce0fee1378f61 SHA-256: 800a034c424fc499a2eacc94d8b5c42c5a77331c664948f9cab3b9de411477bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6197

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://garglob.ru/uplcv?utm_term=entrepreneurship+and+poverty+reduction+pdf PDF link annotation
    • http://www.lnk-creation.fr/upload/file/fubibewafujomozogonuto.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b7305acfc7e---35276815540.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/5784abdbf5e5c01cdb0700581147a931/36843445269.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/fajet.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/loponunud.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/24392117360.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/33e4d46d4beda290fe8240560451cb0d/linigojutobod.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/mesulajovutaguzeturati.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/jaxevadijawefeluroxot.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/67577808921.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e52c22094af---rulapasapopuputezoto.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210619041512_mgpuga.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d23dc865f9---17925340403.pdfIn PDF document text
    • https://mar3ol.com/Files/files/fovupotajumem.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/19085581546.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/27419809746.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/zepalogonezogagik.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606e15f6e7505---65596614561.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/25667988847.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/47138486114.pdfIn PDF document text
    • https://qnzar.com/files/98743205398.pdfIn PDF document text
    • http://dalaichau.com/files/5128937897.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b863cd301a0---nezubujugawuzabipun.pdfIn 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_off0000de44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE44 10932 bytes
SHA-256: 194560ab1a75fca0e2d4f0c1c58af0df3363e875fcc91403aeb7f55661e52824
font_01_sfnt_off0000f78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78E 17424 bytes
SHA-256: af015cfcd845cbc9f47fa2f7d7fb18bbcbfeedf1d1aa1f0821f76e9c9b2ce05e
font_02_sfnt_off000124a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1