Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c7483e33452264…

MALICIOUS

PDF

94.5 KB Created: 2021-09-07 15:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c85fdd42a391c931a42c883f0bef7562 SHA-1: 9427578e86959708dbfa653336be84c24ef6c632 SHA-256: 11c7483e334522643a74c2f472584ec1def80137207dc045b88042b8deb61215
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains a link farm pointing to multiple domains, many of which appear to be compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final destination. The primary purpose appears to be redirecting users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://bijverhoeven.nl/uploads/files/ruwusefufajuvemebobebu.pdf In PDF document text
    • https://unitjaya.com/contents//files/83886971198.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16108aa2b036fa---22077114516.pdfIn PDF document text
    • http://goref.ru/files/file/vonajoxojuge.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/2524798331.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e34a94ed81f---75756022613.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28675296924.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/tigufewarusofisiterevipus.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/65591990032.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/37336827956.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160908bf26dcb6---nirepexuzivisik.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/sosegizejakonekogubuk.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e8eab6b6962---71312621457.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/vadesosivo.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/083982b578eca9489de9281a3672ffad/detifojifumoguw.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/82869880746.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/0vf9qi162ldub89tbftou4u0ng/dokurasorumiwamapirixof.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dd7b8s8uibhmqm57n66uvb5hib/1483331614.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/11370477915.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba62f972348---39612295794.pdfIn PDF document text
    • http://ombs.ru/uploads/files/96860359092.pdfIn PDF document text
    • http://linkipt.com/_UploadEditor/files/14666753301.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/96705283186.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161203e42e1735---wuxizorawiv.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/4fdb797e51d060cecad71fe9671e6136/vokenuxigujas.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/5da50a85a0b3af9b4303156dec11f875/15050446968.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=the+domestication+of+social+cognition+in+dogs+pdfPDF 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_off000108bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000120d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D6 10932 bytes
SHA-256: ca67acb6921e3ce1db710ea60b4992ab4a7bfb2026ee261dcfb3e39f38208962
font_02_sfnt_off000139c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C7 19028 bytes
SHA-256: bd1f24faf88357991cdc8a3ce644f0fe743a3ab8dee35fc1c13cc86316b03d54