Malicious PDF — malware analysis report

Static analysis result for SHA-256 872d5ab18b2c2a32…

MALICIOUS

PDF

84.0 KB Created: 2021-09-04 04:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9a1809661abd38d55dc5a93d2092005a SHA-1: c286a0d4fce1fd290290843930ea9df8db460254 SHA-256: 872d5ab18b2c2a32f3a971840142381e9d3d53d2f833617f87d1b1f9f25724e9
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

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 https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae30582fd78---vejoduba.pdf In PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160985fc686577---35312734406.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/51445378465.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/77402282178.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/noripusefigaj.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/35749091040.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161057b6e20ede---daxikiwaxis.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/butevoz.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160803c8cded73---63870710061.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/77495461543.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/bikolexopowa.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/2a8042fb0282088d667a7880e77a854c/bojak.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/wuwaw.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/87934185150.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/zoxaxo.pdfIn PDF document text
    • https://soechi.net/userfiles/file/nawoledikanisediwaweketev.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/kojepemune.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2b4d46376ceced9caaea6890219874c4/buvenimujevubuloboju.pdfIn PDF document text
    • https://temahr.hr/files/wupejujewifogagosamefaloj.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/c38d1605e6f77f82deb857705afef9f3/duredulovuzawoluwasuru.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/tuwawukero.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/rozowotugigivedixexu.pdfIn PDF document text
    • http://119pump.net/d/files/dematitetinojelikov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=siemens+s5+plc+troubleshooting+pdfPDF 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_off0000e08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08B 11352 bytes
SHA-256: a8a2eff23de93160a96e5fb6a7e5b145b271033003ba6f4e16c6d749bd4a0cf5
font_01_sfnt_off0000fa9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9B 18536 bytes
SHA-256: 25a001830cfed6f71324aae7d4b5e2443dbd665b113d6d2052c62f00eac0fafb
font_02_sfnt_off00012ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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