Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f49148ed33286c4…

MALICIOUS

PDF

84.9 KB Created: 2021-09-02 04:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c6cad5234f2247d76db0c4d172caa0d4 SHA-1: 165ec800bc307d313a6f793736c11a6fc89aabc1 SHA-256: 6f49148ed33286c47e2766c46a74c7626301bffeb74719c4b747e695d66ae786
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDF files hosted on various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the structure suggests a link farm designed to redirect users to malicious content, potentially exploiting PDF vulnerabilities or serving as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://a1-recruitment.fr/v2011/Files/fck_upload/file/50609334071.pdf In PDF document text
    • http://marty-triple-m.ch/inhalt/files/perikiwawivedogipe.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/gedavixoka.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/vovuxokugamirisagubaduken.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/44588802408.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/55116922277.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/63668837565.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/5d839ed8627cc06cc6dff7618024482c/79188159159.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/kusivubisabow.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/36901766545.pdfIn PDF document text
    • https://cubic.is/userfiles/file/diletuzofifitivomiwejuwot.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/tubefuluwej.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/sasinajilademaf.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/riwoduru.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/15220012515.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160abef1f6f7bf---taliwadulomozogijizi.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/juzusiv.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9c1abfbbb---buzejuj.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/vemuranisutodotaxef.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609f70e39eb16---wilijituzulejuwasujiso.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/5d303bb1a210d1360baf54e21995b91a/65867345466.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/rezisuxo.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/silukutofivanunidekipawes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=one+piece+english+sub+downloadPDF 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_off0000df08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71A 19984 bytes
SHA-256: 31769b9226bb2149d19c692debec85032c591d0fcb5a5689a091bfd717b72a05
font_02_sfnt_off00012b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B92 10948 bytes
SHA-256: 4360917e891b7387370d98d211c289f3cb5bc87c73d47f229a1a1e9a95807bb1

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