Malicious PDF — malware analysis report

Static analysis result for SHA-256 9236b5b3fcc77289…

MALICIOUS

PDF

78.7 KB Created: 2021-09-05 12:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 12962373980ecea8f80c01a2138713fc SHA-1: 288f6cafa8a9e5a3ee5e3fe85784b7d9b46cbb60 SHA-256: 9236b5b3fcc77289fbe65c845f4e246e54ad1cf03f937c843a68d3d24112dcea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, forming a link farm. The document body is heavily obfuscated and appears to be non-readable content, suggesting its primary purpose is to host these malicious links rather than convey information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://huntic.ru/uplcv?utm_term=andreas+antonopoulos+mastering+ethereum+pdf PDF link annotation
    • http://spl-designs.com/ckfinder/userfiles/files/lilewasukasomanu.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/74112411336.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/25899825611.pdfIn PDF document text
    • http://comobrew.com/newsite/images/user_uploads/file/degarefaselerejuv.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a22b6d01f69---malutumefavetepiver.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b467e9747b4---86815480630.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/89467970769.pdfIn PDF document text
    • http://beymersan.org/upload/files/nezixigujib.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9633bd903---wogusomewew.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/sajokupukeku.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/vopenibogi.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/88614202017.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/264f5074378b4e38c2d2c6315fd5f113/bezolerete.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/qlbna9e0nbdbvpn9bomd9vo0b2/75681110108.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/a67rt4d5m4e6ee4j03fd2sv6jj/veponotajukex.pdfIn PDF document text
    • http://plncse.hu/php_data/file/65341880132.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611b4edda8ff4---84635046887.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/ralilexexu.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca529ee8f7---koxal.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/xazobusuturorewo.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/moworal.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5d18ae16c---91734021127.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8b6228631---16054356839.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_off0000c8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B9 11024 bytes
SHA-256: 12da91dfdfd88545f08e8e08209d8eb7f1d14caed7a430777eb8538890daa0b0
font_01_sfnt_off0000e1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA07 19788 bytes
SHA-256: d8a10a86f9633f8bf511b0b06c61ec557d0ffde3626765681a6ae8f3568d270d

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