Malicious PDF — malware analysis report

Static analysis result for SHA-256 59536ca6ce0607ea…

MALICIOUS

PDF

97.0 KB Created: 2021-07-23 13:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e53bcbbf8c60a2b15bd4995ae90adcee SHA-1: 7096434f13519e13831d3dd70b86ee82f40b643c SHA-256: 59536ca6ce0607eac3955ba5afd99e38f350c59b2ede8cb1e11f229c57704d63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically highlights the use of compromised WordPress upload storage for hosting some of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbe03ddc6e---zimemuti.pdf In PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021614319538468.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/e3ea61db9061a16a0a78af478fb23ca9/xenuzapatabapexiju.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/gidozelasakobasefofob.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/volewijeno.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90014259880.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/s5i452t5b3lh9g2fo7nkah3lq6/12722984378.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/mupodefipujum.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad88b891f35---mejelagoxagisomukobile.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/waxalurerilizuripopeju.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160869035b1e54---98737270128.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/zakezujejet.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a832fa3e801---guwakuwevigitebanigodaj.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/41405009501.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/paririrorader.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/eab8d98a4666a2bf012f8f25b5cc0d95/90426099456.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c02c9ee3e---33194403259.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900223e83c9---vazifenifosonibozogu.pdfIn PDF document text
    • http://yuha.be/_files/file/88032338752.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/larubininezurapotokod.pdfIn PDF document text
    • https://olterus.net/contents//files/591117221.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16083a392e9da9---77747767759.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/82530894117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=formation+of+extratropical+cyclonesPDF 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_off00011591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11591 18976 bytes
SHA-256: 2ed42eb610f9f01804428cabd47965466a8f066e1b8e67d41943dc522d7381a5
font_01_sfnt_off00014517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14517 10836 bytes
SHA-256: d1e9c621e5f402f31931d1e3e047e37a0906c2ddf155054d13edb1d83e54cce0
font_02_sfnt_off00015e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1