Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f73ff6c2a655cd8…

MALICIOUS

PDF

76.5 KB Created: 2021-09-03 09:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f6299819694caadd0a97935655e6def3 SHA-1: 52b871449c5ac812aba3b697aef576ec84e4f301 SHA-256: 7f73ff6c2a655cd87bd14c5fa23e5239a5ea6c117b453d4062e023e95bf62390
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://allytemp.ru/uplcv?utm_term=virtualization+management+in+cloud+computing+pdf PDF link annotation
    • https://sunrise-photon.com/upfiles/editor/files/37957397292.pdfIn PDF document text
    • http://phs1961.com/clients/2/29/29da8dc1278d8f1c58a3d16208bcb4e7/File/foranev.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608eef3310ef0---54779714090.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/vututolodosoxor.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/032b2b24a7f609afee4a1c6271ba5eb4/32219706810.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/likuzulanaxizuvijabu.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/botefojuvenerawopex.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/vevorat.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/mosinosobofimamoli.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c86f134d15f---46985152715.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/24313840118.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/91909360053.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/68948906759.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce1338c939---85296370191.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cfea0a68a---60933780641.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/fugiforosijirixobuw.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/94352765932.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/73811532235.pdfIn PDF document text
    • https://bgmediation-flm.com/userfiles/file/rikujasuriza.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16104bab73b90b---65831480210.pdfIn PDF document text
    • https://campermagazine.tv/public/file/wajuzuguri.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4288d9e0e---nagatobitajunoropevoxoxa.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/3c4932cc38ddc5a7b66a55dafe92cac9/wejobebejiborapipima.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_off0000c814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC814 10924 bytes
SHA-256: 7010c560b271d2020ebe5a681c96ade5e4c7528e5495e120f9a40d6421b69085
font_01_sfnt_off0000e137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE137 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF949 16620 bytes
SHA-256: 02b61ab842ee8f58bf0050ebafa9fa0816df131ace41c19f5ad18859c92f9bd7

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