Malicious PDF — malware analysis report

Static analysis result for SHA-256 4422b35f7b45eb23…

MALICIOUS

PDF

83.7 KB Created: 2021-09-03 23:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44a0d390bf64a4a505c5aa10412dd7bb SHA-1: beb5b60168079f629a70a3769dd489e72d836c7e SHA-256: 4422b35f7b45eb233ac6ed119bb1161d9a73264164307b83b8b615ad23a0bff9
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to various domains, suggesting it functions as a link farm designed to redirect users to potentially malicious content or phishing sites. The presence of multiple compromised CMS upload links further indicates a malicious intent to distribute harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cructi.ru/uplcv?utm_term=manual+maquina+de+costura+vigorelli+automatic
    • http://rickgrisolia.com/userfiles/files/pelavuxisa.pdf
    • http://bensonlandscape.com/editorData/file/xanezukarebogedavufali.pdf
    • https://aedwea.com/upload/foto/vigonidiresaz.pdf
    • https://suadienlanhhanoi.net/upload/files/meguxenafunutix.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/gl35h6ovmv052f81tc22svluag/78702229471.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/c6faea7feb17f9adacf35ecd0cc7da08/88635077628.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee7aac6bb1---zefevibiwiwinu.pdf
    • https://gulfsupremesa.com/ckfinder/userfiles/files/sefunidepor.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/df65c9626da8c2b30e90c4c3e3f912b1/57935049221.pdf
    • https://biorenta.lt/ckfinder/userfiles/files/benalufapane.pdf
    • http://hydrogears.com/survey/userfiles/files/pejipam.pdf
    • http://onlinevay.com/upload/files/gesetovamasufobejer.pdf
    • http://ordineveterinarivenezia.eu/userfiles/files/lepusipajiko.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/ifdqj1ts555td7qcgqh2mhlcs6/99269257230.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a131b515765---87553799101.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e135c9a346---bodunitalepa.pdf
    • https://kede.org/userfiles/file/dotidufetujusigavedixoza.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608125961952b---17656879622.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/969751c4b8e2eeeaf62fdd68cdf4510b/disawatuveradarujuga.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b501c650f8a---45403188482.pdf
    • http://blackhorsesc.pl/userfiles/file/60068181367.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ae478f63d---25870311956.pdf
    • https://guclupin.com/calisma2/files/uploads/34912407634.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078d606aa4eb---55000334438.pdf
    • http://urduhadith.org/survey/userfiles/files/ravakozixojimuj.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/05e9ebdd285ce4d01cfd6ff61e6d8566/belupo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc7f.bin
0a7308b280c54a152bdfc4e24fadad9104b2343fb4d0d63024e4ec426546c4ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7F 19628 bytes
font_01_sfnt_off00010fc3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC3 16792 bytes
font_02_sfnt_off000127da.bin
9291428a61363e5816302920a04d5a9afb0825de42e422f7f62e1cc834d7726b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127DA 11016 bytes

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