Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c2bebcd1a1b1be2…

MALICIOUS

PDF

87.2 KB Created: 2021-06-08 17:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1881cb9144626211d206f2f8504c18f1 SHA-1: 91dc0903ec004faba3dae53e91f5ac4919476a27 SHA-256: 7c2bebcd1a1b1be2f53aff94de51cf9d601e8797f23ee4bf4dabd79ff8d87378
154 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing and trojan threat. It functions as a link farm, directing users to compromised WordPress sites and disposable hosting, likely to facilitate further malicious activity such as malware downloads or phishing. The embedded URLs and the nature of the heuristics suggest an attempt to exploit SEO for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9847

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 https://krisoc.ru/uplcv?utm_term=ong+bak+full+movie+download+in+tamil PDF link annotation
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/838b861df623998edbd0d9a798adb9cc/96027865537.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809a622190f---dubukoladaw.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c82bc7f6---wavibite.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/2133b76d6d06dc59155459280e04433b/38767733937.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/xatunogevokanipipiwatu.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/15033ccd806958288ce63427aae79350/46080073418.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/8082839346.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce1789fa34---18939992115.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/68156839064.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7c774281a---notawiziwuwulip.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609529bbad53f---dubusawarim.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607221855c9bb---29761271279.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/dafefidozakomol.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/4gfvi4254nneind6n6oddvheih/19623176147.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9875cc08b5---nipogokozitiditoru.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0001029d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1029D 12544 bytes
SHA-256: 424dcdf15bf09fa5fc0cc9c1251025d03a83c05def0c90bf7032633aaf3070f1
font_00_sfnt_off0000f06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06B 5336 bytes
SHA-256: e26657580eccbd7775726ab4da3ec7d20a38b792873d304aa7c89b13c57873ef
font_02_sfnt_off000122b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B4 11168 bytes
SHA-256: 43b3f32cb6cd4b28d29b120d70769f6467363483821021a97a188351ffbc2526
font_03_sfnt_off000148dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148DC 16192 bytes
SHA-256: 1ff76b967cdf3bc4238cb8097aa9d4755c8fb5bd66c4cf01391f6e70ad1e9315

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