Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6d7eaac47f16d4…

MALICIOUS

PDF

111.0 KB Created: 2021-06-21 00:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 78b20146827f9d398c7f8c2f46e6a64a SHA-1: 1584d1b6227a0513dc4b49374cb5ce1ef23bb32a SHA-256: ca6d7eaac47f16d477fcea8f8a3532dd9107ec82eed98463c8391ac878b20c5e
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6512

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://laborke.ru/uplcv?utm_term=surah+rahman+pdf+alkalam PDF link annotation
    • http://clinicaveterinariabilancino.it/userfiles/files/zipoxojujigifup.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16218573188999.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2eae00e92d---funufixad.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/92255711013.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/kalonijo.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b9942d7c4---17896663409.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/76534858351.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/29601740260.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/f6cjgkgop6g43sp3dufod0jf1m/67703272412.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b9c1e435b---75854603725.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/viwonatote.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8d9d4d1ae73315a185c4baca462134bf/44171769533.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/30027505845.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/399d70e799790ed44896b1ff857de151/70638197865.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/86267858903.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00017e45.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17E45 31416 bytes
SHA-256: d2be02c23908aeb04cbbb34908c2d5d7de365d0d9a53cf0045e33b78bd58aa5a
font_00_sfnt_off00012dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD0 1636 bytes
SHA-256: a9ad9ad0a96fe26ac6797df49b1e626b392e9366165fda36ca18888fb22e3261
font_01_sfnt_off0001360e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360E 5268 bytes
SHA-256: 3bfb77984fff100ffdf96649cb25ec8301afa9fab4c86a2c9dc34bc72ef84c8d
font_02_sfnt_off000147cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147CC 2984 bytes
SHA-256: 97875d66a09e4b0af200934190882c185d82f6187ee0d245d48b3a80d51dc8d5
font_03_sfnt_off000153d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153D9 12960 bytes
SHA-256: 5af5273f1aaa15682a1490468fd2757d966824c0eea70eaa4f3e35da6ead787d