Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aca811360cbc87b…

MALICIOUS

PDF

69.8 KB Created: 2021-09-05 18:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1ef53c939c02178542e4b1c446c30f34 SHA-1: 45e7866c0abb2071a241544dabfe618771b6e059 SHA-256: 2aca811360cbc87b1897161350a8e4e62caaf0eef83f1f73162b61d7cc33af83
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The PDF structure and embedded links suggest an attempt to lure users to external, potentially malicious sites. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript for malicious purposes, and the overall structure points towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3616

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
  • 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://bravo-hk.com/userfiles/file/75553445815.pdf In PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/afb3ad181fc447803a538d0e5e9d545b/kikulilirex.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/8ml5q7j22jajpenjubm17k9516/44696820233.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/ponob.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/jusurisorifunugiruri.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074999ac4463---23022449242.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/zefitakatafedo.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/8974351801.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/3893710080.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/779636955c66f8998ce0e5fbea2b1920/gisofegofivaxelorimilef.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/94355640745.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609765133061b---75998986665.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/gd29l0m60o8n7drfsp3a6qcl34/kidibipijiwisu.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/bc5qgjt4cdck0ib1sg12m9jvu0/59213944988.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8769c4866c---serufogekopibadenepudag.pdfIn PDF document text
    • https://dhesient.com/media/kuxoxavapozazasemixi.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/xurepifomuvuna.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/35807231272.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/vigesodirejalofisibitu.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/23900699819.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/13265706471.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/648c4665302aad34724a569264553958/6416843149.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/fipanafujoruluwer.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/75429190939.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/29cfe6268dff4382e17134d92d9a5640/tosulonazekawasapesod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=my+romance+piano+pdfPDF link annotation
    • 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_off0000bae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE0 16200 bytes
SHA-256: 02963dba86c3208bddbd032244aa1c82cfbbfcfbfab943ee923257fec0972f70
font_01_sfnt_off0000e4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CD 10576 bytes
SHA-256: 4d3f2441205619ab8742d2886dbb0c35597d04700ae32d6f782410d47ffde664
font_02_sfnt_off0000fce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1