Malicious PDF — malware analysis report

Static analysis result for SHA-256 b24acd42b5693c56…

MALICIOUS

PDF

84.5 KB Created: 2021-07-01 18:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5d08d3aa284e444b5076ee6eb1968c8 SHA-1: 30151413eae3dc6c2abf797e7a1c967ded032246 SHA-256: b24acd42b5693c56c54803297c2c14c024cb638e8e966abbf26225b92157ab4c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the heuristic firings point to a malicious intent through embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=how+to+unshrink+jacket
    • https://tangentemag.com/img/file/varek.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/n4sujf5c9gueavs13f4num5u96/xuwuzobumibigokof.pdf
    • http://brezov-gaj.si/uporabnik/file/nexinamalopamovagov.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/301cda46f4ed9899f10473dd74d08591/dilidafomedujisejuza.pdf
    • http://bularz-auto.pl/images/userfiles/file/nizanegoto.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a5fd26598---84283163543.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/af432aee79799b635d0c979830ae6337/80702270587.pdf
    • http://www.hydro-tg.pro/upload/file/65937171068.pdf
    • http://csc0532.com/userfiles/file/20210629193604_ov54od.pdf
    • https://tavio.ru/files/file/35407462061.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/a6f7ngrmqmfba4dm29fqgk4luf/netewipisosuribelozuget.pdf
    • http://midel.me/userfiles/file/kumup.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609de24db5852---41433209354.pdf
    • http://ned.ru/uploads/files/48147999051.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfaa0186f3---84354718064.pdf
    • http://bishnutoursandtravels.in/userfiles/file/nedorogutoxizoripekategek.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083442915877---tukupuvip.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/bd5827641fc046713f0a57978e15c5fe/nabapedonul.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/5b44e3919020f38048d1006a9043d918/fomifapuzo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae49801db2a---43556064889.pdf
    • https://cometsecurity.in/admin/userfiles/file/sixaginokelijazexokef.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd75b1c913---28763485514.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083e80d3a011---49390739647.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160773139bab84---97724361032.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160855298b1a2c---nevopavekek.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8b1.bin
d217629dce2b1c7056cc58c53120fcdcae760dfed927eb0aa23a3dfc0c968838
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B1 16772 bytes
font_01_sfnt_off00011445.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11445 16792 bytes
font_02_sfnt_off00012c5c.bin
f50a2b8ca835947f2fcf6d9e3842267cb4951895bd8caf53e0cd4acd68ba66b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5C 10680 bytes