Malicious PDF — malware analysis report

Static analysis result for SHA-256 96422b58f781fc51…

MALICIOUS

PDF

73.9 KB Created: 2021-09-17 10:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c9cef1a3504ca29a8c6b852c478cd9f3 SHA-1: d0808e4b128eb5eaadce8581fc86ccc9cd32b663 SHA-256: 96422b58f781fc51d5dba75d8784ea7c2b782e54c1a770c708f1d3ee8974a656
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF link farm heuristics further supports this, with links hosted on potentially disposable or compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sherwoodonionfestival.com/ckfinder/userfiles/files/wulavad.pdf In PDF document text
    • http://akademibt.com/resimler/files/zorufenufoxoke.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161429fb2c564c---regunasoxir.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210915_0329D3E85E8663A0.pdfIn PDF document text
    • http://briztravel.com/upload/files/47455888405.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/mobosufejegolexitatixag.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/supimirozojade.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/65813348761.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/5258213fd98019b9bfcddbeeaa943362/pasubisokaxonopor.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/xijinebumefuralip.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/66499159873.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133b4332855e---36980635954.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/lemotivudof.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/31725064912.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbe1e36510---97687796821.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/95647654022.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/09/fanuveziwuzud.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/78975059276.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///12369784690.pdfIn PDF document text
    • http://djapm.com/userfiles/file/66530052632.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/9donhu398bb345ratiff25ggn2/lejufilorufunetofer.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/30658110253.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/99059880754.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/1a43dee47e567b6c969b621b8ae51a06/75745757649.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=email+grappler+download+for+androidPDF 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_off0000bb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB86 17704 bytes
SHA-256: 94da73c3efe5c9eea798e4364be9592eb20f04157854fe57ec5f2b03b51aff8a
font_01_sfnt_off0000ea23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA23 10644 bytes
SHA-256: f98a94e8fed2ee0943145e572b5e82af12a21513f76db7579b839cafcaaf683b
font_02_sfnt_off0001023b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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