Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8044832dba7f9bd…

MALICIOUS

PDF

73.4 KB Created: 2021-09-06 17:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6c3e3b9df26e3be8f210de56a4c5d647 SHA-1: 70a5526630e01f6ed9384cc691508fdd4cc6cb09 SHA-256: e8044832dba7f9bd20504e66c8b4a6fd26abeaeb67df8a46c67e453d93f76f0c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, with many embedded URLs pointing to various websites, including those hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5832

Heuristics 5

  • 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
  • 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 http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/676094e82a5a8907714befcb0658f43a/70595062503.pdf In PDF document text
    • http://aps-mes.com/files/file/59855660195.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/pozadejodogarereb.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/6bc8caf02916b1160711a2a8ef9ef2c6/98553456628.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/25524015295.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/dcd578a38105b4585e0920e3cbf28aa3/35943226024.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608db73b85a53---xaxenanu.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/10248123895.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/rifanug.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/ziwefasijepu.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c781a34772f---53339693242.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210714125921.pdfIn PDF document text
    • http://samtle.net/ckupload/files/farelipawaseb.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607865a431904---13937648446.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/bivarekoxogebelopiziwiba.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/xuvawemasawidotuvokirime.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/gnnuid2h28n62ao485cj8glutn/54116680638.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/55209860045.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/vafizalometibira.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/vudusagovepokanakeb.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/bebotidepolepulak.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105122103.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/deniwexavuso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=riptide+ukulele+chords+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AD 18868 bytes
SHA-256: 6e5110fdfbb2fa42e674a9dc26406da5e53d35c2bcf30e8716a44b89710790a0

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