Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8276088423452f5…

MALICIOUS

PDF

82.0 KB Created: 2021-07-08 03:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 14eea65c44cf2e729a861f3cf0b40839 SHA-1: 310dc6c1d0de069b6de24c39f43a7e4331f0167e SHA-256: c8276088423452f5328cf5cd2763aad9e8f38a95929dc07b9838ba450e73cd5c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://dent-pro.cz/pic/file/22978507489.pdf In PDF document text
    • https://balajitutorial.com/admin/userfiles/file/xefekeduka.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085dde5899a8---67168369374.pdfIn PDF document text
    • http://acrgroup.nl/userfiles/file/21264820666.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/samop.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/ibutui4vp0hu3o45gjbgdd7q10/mejorinepijami.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9feefa85a7---3359420796.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/6719301339.pdfIn PDF document text
    • http://sumterhigh89.com/clients/863574/File/52600570789.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/6e39ec8c70708dec5f061f0e2c83fa6a/5949188417.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a605c35f03b---zaxefuropoji.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad2cae1747---673939477.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/72681956615.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/df726669230050d5ef5aa8ffb41d10c8/sipexafubajumepukubavi.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/kejulufalufimunanosakuzus.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/dilavabunekedobaj.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/63170778331.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fc0e0bac0---36580606189.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/jamaregixipotimu.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/4c31c528ba5a05e877dcd34f5c367a8f/goleditedavivemug.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/56907974373.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160757489b7c5b---volojobarokebup.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/tonemumuliruki.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/c04ae1e7f78f7983e453e488a5b200d8/4766722049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=portsmouth+arms+sawmillPDF 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_off0000de41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE41 17240 bytes
SHA-256: 638023efc4ec236d000fc2f844d769b06d7740b8bdff049f2334f1502affb5ea
font_01_sfnt_off00010b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B53 10324 bytes
SHA-256: 9594cb31583febfd3504cb0f3b74810d77c3ce1796bf05725be558b2deaa2205
font_02_sfnt_off000122af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1