Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0f1bb1c78bf0916…

MALICIOUS

PDF

84.5 KB Created: 2021-09-22 11:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 33417262755e21f5986552a3889c93f1 SHA-1: bce3dffae224696b91bfe381024440976c8db784 SHA-256: e0f1bb1c78bf091682d3dbf61b1816a9c08bb80f1b68b17ce91ad65da690e41f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest an attempt to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://phutungototuanphat.com/img-tvdl/files/pokoderude.pdf In PDF document text
    • http://weingut-suppan.at/files/21274673920.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/97761344926.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca9be490c7---josopesiliruvole.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/xojikatidupuvoxakos.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/93209089581.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/92494425141.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/48113004722.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-2/20210902093012158997.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/6f7fd763d4f467d9d3ec6b6917d121cf/26166167942.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/kumofira.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/18354724930.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/89743039743.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/mapexal.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109072002264327.pdfIn PDF document text
    • http://cutskytools.com/d/files/vativirafinet.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/tibakonesuf.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/29768874312.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/30596568446.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161497244ec2e6---xumukusirusumadulevog.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/37603266597.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/18147021981.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/32269711095.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=custom+rom+for+samsung+note+8PDF link annotation
    • 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_off0000e47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47A 18080 bytes
SHA-256: 8a53e0946d3bf92e5c23ffa699cada9ebe50eb0e5edfa7e1fde9c54937ca0697
font_01_sfnt_off000113ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C04 10756 bytes
SHA-256: 9b25f7862b97812734b9aac769f591a5097744551b6554571a1e1b49a1a6c8cc

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