Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd77df6843085087…

MALICIOUS

PDF

88.5 KB Created: 2021-09-02 00:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fb17142e2bf9d556f8d9a41fa32335cf SHA-1: f4c6b848ad6ee8189d62815790d9b27b959192f3 SHA-256: bd77df684308508708bc4ea96ce5c207dd17b7b9290f5400a46d2f8ff3517e7f
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's used to host or redirect to malicious content. The presence of multiple URLs, some hosted on potentially compromised sites, supports the attack pattern of luring users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160811daba43f6---12510549975.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b167cfe06e4---62509637399.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/tehrm5ieli1rm154qgrr6hr21s/nebedafojugeboleriw.pdfIn PDF document text
    • https://anfauglir.com/images/file/kovuzapat.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/jlcbeerjldsu6sl8s7oeeqmrrp/42488938583.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160d5af3f62ea2---zilaxunirosigu.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/cb3202245323b77600034c49a56652bc/gusabodorixaneri.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e49da845a7.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/20357501298.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750c77023e3---64567770033.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/fijobejizotegawusote.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/rojokowipedejo.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/704d9d078bdf81553163b473981af8ef/22868675043.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/27244720018.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/kudajevirezosoputas.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/dagepoleverevaz.pdfIn PDF document text
    • http://poiskvod.ru/images/file/96456776329.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/fagefavalumejuzevejiwu.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/55228789770.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/65080448995.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16114ea2948d1f---70253179815.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/59077858630.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/valupoxumevudibevugon.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/70918908141.pdfIn PDF document text
    • http://signauction.net/userfiles/file/kedokexumakenavit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=mild+atherosclerosis+of+the+thoracic+aortaPDF 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_off0000f7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BB 10460 bytes
SHA-256: f5403efd6ce8e1c7a922407b46d44836850bbe2197cf8af5639902a755fe0f0f
font_01_sfnt_off00010f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8F 17156 bytes
SHA-256: abae49709326e161dcf59c879c588f0582e5e729d3dec896ff97eed4016e157e
font_02_sfnt_off00013c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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