Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8bd5b5f6253bfb2…

MALICIOUS

PDF

92.0 KB Created: 2021-09-06 08:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ece55d27036943fb262e879ca82105d1 SHA-1: 7ebee77e5fff4a6846ca6c2057bb63ca4d8da525 SHA-256: d8bd5b5f6253bfb276239381f7aeac939295a5d1fa2d51add1e2db4326736e52
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing phishing content or second-stage malware. No scripts were extracted, but the extensive use of external links points to an attack pattern focused on redirecting the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://queure.ru/uplcv?utm_term=how+to+save+pdf+book+on+kindle PDF link annotation
    • https://roweryelectra.eu/app/webroot/uploads/file/163028211348.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e473a962---31717615722.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/fj091kvmqqglvom0uv01ec5ukq/22900523526.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210730_AA83238529D340C8.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/6c64388e18e8b5df94f4765a76c6c168/7792254383.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/946deb7f7c895d252dea70c87e773edd/xofuxogobuwovewojazuliwav.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160fce406cfd7e---vexatabefejasebepud.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/0775d2a93b2953b73defb930ed9fbfcb/56378542691.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe01f85978---84091774271.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160775636dc7fb---87928024192.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df78a4d903---mipavoz.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/jewab.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/2147474957.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/lenowis.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/medaxejapobedusaxa.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/vifixilidefigiwibaz.pdfIn PDF document text
    • http://recrute.fr/files/files/79486549043.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/tigunu.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/miruxepiruviwafimupul.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/80130806514.pdfIn PDF document text
    • http://mp-journal.com/media/file/sujad.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/2177b5c974d4d94076f039604536a280/tedakisapegilabujipatanot.pdfIn PDF document text
    • http://gchsclassof1970reunion.com/clients/6/6a/6a45fbe13d63dbb0eb8070d7cb9dbc89/File/95530053924.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/36jb5kl5o78e1l8l9da2nf4r34/51527234775.pdfIn PDF document text
    • 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_off0000ff8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8F 18840 bytes
SHA-256: 6abf8d5a4350509217654840d415d383e4e5b1f174813b54e44d73661d55edcd
font_01_sfnt_off00013135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13135 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001494c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1494C 10768 bytes
SHA-256: dfea67335a37d6e75b68cb49adfe3068c4dc5817d1fbc42c00723a3b713f37f6

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