Malicious PDF — malware analysis report

Static analysis result for SHA-256 22813916b71419cf…

MALICIOUS

PDF

89.2 KB Created: 2021-07-18 09:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a50ad7d58f91832bb07e3023ec78e2cc SHA-1: 9e6fc97ce714cef0feec9361bb3677eb15202408 SHA-256: 22813916b71419cf4e148f3b9feeda42f96dd69ef4f95f3297312e83d6000eaa
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a malicious PDF detected by ClamAV and ML classifiers, containing embedded JavaScript. It features a link farm pointing to compromised WordPress upload storage and other unknown hosts, suggesting an attempt to host malicious content or redirect users. The presence of a visual download button further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf471051d7---lugisafezagisitok.pdf In PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/58195719183.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/11091565448.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f22e251a045---besonubamujenite.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863f330b774---zodaxirimo.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095113b4c543---melibupunujeg.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b3861f835b1---91369329586.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/1e5888f0745939fde2a508e10c540261/65248555240.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/58815690423.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/tunox.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/28479503399.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e0ff55f35---1173699815.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd02035e1f---10232805419.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/xopabopisusinafesukenil.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0cab28d0c4b48c68fc660f662984133a/dapopifezijogaludo.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/4592bf7ab5471062cbbe1e5816e01edd/kezefusilegejedopawevejil.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/rerab.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/jokonifanunatunasube.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16082b9fc206d6---92291486796.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210526195847.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/6vhpkf5lbppts5h51qlr7s63sq/31468430121.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160adbdc9da13e---14065892289.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/73981516538.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/25049372136.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/352bf1ca63aa8920c3a4bec4ba1a2924/80334270572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=procreate+free+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_off0000f853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF853 10296 bytes
SHA-256: 8d73146a37c40855b77e88c4375eea657af3117ca7c47fc706efebad20531894
font_01_sfnt_off00010fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB0 17544 bytes
SHA-256: df359edc7e58063e8881b92b61e3264486c59be4ecbefef18db8274890d836bd
font_02_sfnt_off00013d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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