Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d15e04253318421…

MALICIOUS

PDF

109.5 KB Created: 2021-06-26 15:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ce93f19718a0d2dc38d4f51b5f8416bf SHA-1: 61c243b48b43ccc3923b439aff577f0a8560657e SHA-256: 2d15e042533184218775c769ed39b96564626efe73fb6ded55f1e09d733c9f80
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to serve as a distribution point for further malware. No scripts were extracted, and the document body was unreadable, but the heuristic findings and URL analysis are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/m8015nb1pg2oflauaf3foell8k/94683120262.pdf In PDF document text
    • https://schmitz.cz/res/file/zefivazataku.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b783c4ac5c0---29892871107.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834c6c28683---87437924970.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/37021929805.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c008582ffc---35309885789.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/79ea3b356b5b62750870c6abee4ba40a/2813539206.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/cf55ef809d417bea0d54d952ec4f1a2c/73312379359.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/nujagojadoxibepiwodirosan.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8557023250---monibawubeburaloxivenowo.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/62718515922.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/a5e7ea29056b36d9bfa9d97caf732b32/zevotibejajejidepoji.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ed93bc23f---52144879573.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/7977dda415b42ea5e8cf535166753bc4/13895451284.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/9b4f016ad00e1b672f5183775e0745fd/26211877628.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/nivunedilanezew.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160941438800c2---jadexis.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/penuvexasulekebifexufomon.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d467649e91f---kurewojumumukosotolemila.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/18384636295.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cdeb3368ebb---xedemeguwurisefuxi.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809a5b69597---95884537598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=1988+best+picture+nomineesPDF 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_off000147db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147DB 10896 bytes
SHA-256: 3efdd299c80002b0f77fe6fda0f5f9998bed1885ae07d2deef5f78689cedf4c5
font_01_sfnt_off000160eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160EB 18196 bytes
SHA-256: 058e41e027939c413c1d9b5929d0f981c44d285a30dd8c716d8434a449b2b8c6
font_02_sfnt_off000190c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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