Malicious PDF — malware analysis report

Static analysis result for SHA-256 bacc19612506b920…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 07:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d07db870aceda21f57a64c9033f8278a SHA-1: 08a382d4df77cdcfb29f2452a5399e688755fc53 SHA-256: bacc19612506b920ba2b19351091f5b2430eb47083d56c4d80f2ede1794f4a30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting it's used to redirect users. The PDF_URI heuristic specifically points to a URL containing 'tipos+de+suturas+y+agujas+quirurgicas+pdf', which is a common lure for phishing or malware distribution by impersonating legitimate document types.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • 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://ketchas.ru/uplcv?utm_term=tipos+de+suturas+y+agujas+quirurgicas+pdf PDF link annotation
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/nadugawimakisexere.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/61839fff421c6392cee047dfb93257a5/56565765514.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/52740072592.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/28673897903.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/49691150784.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/tavepenowedigomufuxik.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/waziwuzuvomidazisetudosi.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/narivaruwibidesimakodusu.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/57639274247.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e46cf224c---givusawob.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd0b0d83993---73092572735.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/suvekezaniga.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b132b015f4d---kavorewenivaledobesir.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/mewuritopiposowox.pdfIn PDF document text
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/23104550448.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2aa57b6aa---2649984747.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/b9944490c86a9ba0736079a1b96f2d33/tegarivido.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/11929295303.pdfIn PDF document text
    • https://congchung7.com/upload/file/lalavobenava.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/bikikegegiguwiginupese.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/tavodovewumani.pdfIn PDF document text
    • http://sakem.org/userfiles/files/83298582683.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3ed44f7de---mejuzo.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/k2etobr97eljcce62ofplr56ll/vokitozusiwe.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_off0000d821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD821 11096 bytes
SHA-256: 877f4dce28a17bc21ab3147e5d511970e3049bdfad94b2fe2f855b4a1452c088
font_01_sfnt_off0000f1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C1 19152 bytes
SHA-256: 948de3aced3fd5f5d32219be02b4e9684219446c40147e33da5c2845df26d7cc