Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ad7cebb959f9fc…

MALICIOUS

PDF

91.6 KB Created: 2021-07-27 23:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 7653501fbeaaf02820bc541051ab5b7d SHA-1: c229c519a8c5a5f8d7f361f96bb40748345f14df SHA-256: 58ad7cebb959f9fc642c6fd1503895fb4f0da1bda84e9641fdaa0d88ac49fe5c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious PDF files. The presence of multiple links on compromised WordPress installations and disposable hosting suggests an attempt to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a13d5eab745---wezafinokevam.pdf In PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cacbf862ed5---tivunazoxojegubevami.pdfIn PDF document text
    • http://etnorom.hu/pictures/87908952130.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/72121892517.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/10541248503.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/jofedanomigerinevategin.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607064d3abdcd---rasaluv.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/nomulevix.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baff9998233---tewanuzilina.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607312b746143---tuxomilon.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/serisulosopenupol.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b05ebf7e229---jiguvizivomuwatavi.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///23592128191.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/580ca1fb4dd9381b49b377cf9e94856f/doguzunuzo.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/mikuwox.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/54ca15d2825fafbc56af907dc087a1f4/rowudedigodak.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90142ada8f---47095362470.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/53788598505.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/dosut.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca70b688e4---zetijunodawujikasopa.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/443e5a231829e9cf03c369d81ee2b722/81139240818.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/18677560267.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+unroot+samsung+galaxy+tab+10.1+gt-p7510PDF 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_off0000fed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED7 17568 bytes
SHA-256: f49c8953fadae67e405a8b018a8334e83f66a879b469fa5502865c05fe83feb9
font_01_sfnt_off00012c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C47 11364 bytes
SHA-256: 2fafe530c438550419397b4ba33253565e5a77119a37626bd7acb3f2d62feeef
font_02_sfnt_off0001470f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1470F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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