Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fb28b59bb4191c4…

MALICIOUS

PDF

69.4 KB Created: 2021-09-27 07:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 668f86607bd73840553da864f7c234f6 SHA-1: a52c0bd35253026e0b3e51fb4a6c6eda87541d60 SHA-256: 9fb28b59bb4191c4683fd4e61db73022a8781a57da3acc82152732dea3e2bc2b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=above+all+kingdoms+above+all+thrones PDF link annotation
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161510ac838aea---98062537502.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/d6g0isejo0rt8ko4ct60oke76d/fiwes.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/riferujejogenobusevo.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210909051656144.pdfIn PDF document text
    • http://rotang.net/userfiles/file/74082347212.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/jenuwogajis.pdfIn PDF document text
    • http://korytnica.net/data/files/14769837067.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/sopiziwemawezuxexu.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/vofugajavigugifejifet.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/30b25ea149d8e7add14c9f1059cb7334/kupafawiwoz.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e855e4bbe---26408354029.pdfIn PDF document text
    • http://escaletravel.com/userfiles/files/14201578810.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/86048091014.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/63469113884.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/51682133280.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/sagebaziba.pdfIn PDF document text
    • https://novitas.ro/files/polejojume.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/daspjadk5fleacdmo5pfa5kqi1/rikunekugaloresinumufaki.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/17799380540.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/d312a06026fd94eb8e3d8c2a35e65abe/44717774732.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210917_F64E31F79131B4AF.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109060418428173.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/5672754785.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_off0000aea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BB 16044 bytes
SHA-256: ed93aef9d2beb5e5bd917fdf3d66938bb18291f9d5c16f9b09e145b62d10f4e3
font_02_sfnt_off0000ef13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF13 10972 bytes
SHA-256: 2a344a7e57f6558ee62cef04ae96af51cea887e9c800c048813927e365211d6d