Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9efbb519d62e34f…

MALICIOUS

PDF

94.6 KB Created: 2021-09-05 04:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b6e2529f62abdf355273e30d00b2aa82 SHA-1: 2b5471ed8e901420bc7a064cd1ca6b6e7f8306bc SHA-256: f9efbb519d62e34f6d10fad3f59cbde2250165444ea59e0bfcc3810c3dddb4e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware delivery mechanism, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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.valathors.com/ckfinder/userfiles/files/gudifoxadulimu.pdf In PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rma6ip8qeo3v4dh7aj29pld4f0/83318449005.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/19740630514.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd9735be2e---15838875416.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/94023546010.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/79706948967.pdfIn PDF document text
    • https://easybuildapp.com/files/uploaded/files/14898291470.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/zupogotokazijemugane.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/966779253.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/85824058459.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/zananukirefi.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3a83a78ac7---junemafuvupawojimuwel.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/20369937655.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/bizivasozovif.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c45cad1eb80---venan.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/95322809536.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a70f23c2abb---puromijezekufutobofubaxed.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/niwomot.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4a632274a---20682136735.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210522082315.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/91001856820.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210726_970A48F3CA16692F.pdfIn PDF document text
    • https://castel.ro/userfiles/file/sokivodinufigonekolutuga.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/siremetufepabodofofali.pdfIn PDF document text
    • http://centurionim.com/userfile/batiment/file/43064641316.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=sample+rental+application+form+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_off00010d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D04 18376 bytes
SHA-256: 8dc324edd34126a8c4d3eb65772b6dd9f80670614f19067af2e872da23a3f0ee
font_01_sfnt_off00013c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C4A 10688 bytes
SHA-256: 002813f7b4c14826fcb708586cd3e29c7c5437640ec16bc6bd7eac55c7b13857
font_02_sfnt_off000154c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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