Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f830f3975406e2…

MALICIOUS

PDF

84.2 KB Created: 2021-08-05 16:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 24eaeb49f62bcebc0eed6ef9159aeae5 SHA-1: 263850163c2b225ea7b77467fb9d9eb0491c988a SHA-256: b5f830f3975406e26c08cd26fd48e7183b670d11d6dcfb7dacb965f850651e73
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://kenadong.com/contents//files/rurijutawujigoxojebita.pdf In PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/71542770555.pdfIn PDF document text
    • http://asustainable.com/global/file/posapokowadikimopuzemasa.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/23277200083.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/tulotu.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/36295620323.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/guxejuwoseduwebezinurejo.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f460995e65---47106251068.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8886a62ee---8695592641.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/5cnirns8v2j47loj71l0mhh1n4/bunipiziwim.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/fulanabubi.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/mskrf06h4atj06s40m29ng24bm/katak.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/3348ddf5babeb466d22d047bc6cfbdb0/96319587841.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607419cff29b3---ledinijodixagariben.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/fovufixamib.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c772ef499---tuwuvumopapuzif.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/j189t5npup7mso3sr8lbrn7aap/ziketewenojo.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8810f5ab1a---55469284571.pdfIn PDF document text
    • http://schokozentrale.de/idata/mizutumazuko.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/87708807415.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/kg3lqpb7qpb9u38lbtaa4qtctr/wiwiporenej.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/paselu.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/raxodesawezi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=54321+grounding+technique+printablePDF 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_off0000e2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD3 11468 bytes
SHA-256: 32d702119b42cecac1e4bd175e41cf76609a20062508ca314ebf880ca5e0cb0f
font_02_sfnt_off0001152a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152A 17036 bytes
SHA-256: c00ca1b5c707d5bd2fb438a602ed863607e2d308d9013391654b37c4d9ae8cf4