Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fcb40f80212b5b9…

MALICIOUS

PDF

84.2 KB Created: 2021-09-08 02:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0ad1a6d93aee299dadbd102684920cec SHA-1: 3d4a077c39cc0e31a0e60b854f631552b39b22d4 SHA-256: 4fcb40f80212b5b90602d886c0089290ac57805b724b429e016f57bc41166cc1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains, suggesting it is used to redirect users to phishing pages or download further malware. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=blueant+s4+user+manual PDF link annotation
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/1lft6kvnd2bec55bcsfb0qpgts/lakutabewobenijapu.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d822fa8bcb2---33745126783.pdfIn PDF document text
    • http://garderoba.sk/images/_file/xogipaburonurebureruk.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/54166126065.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/zumafikowepilofi.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9e3940589---zopaxe.pdfIn PDF document text
    • http://gotween.com/userfiles/file///27856709211.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/koxidoxur.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/au7c2m3tsfl7gh6aomhip0j3o5/luxabuluninof.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/xepasazekoluzepudalowu.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ef507c9bd---88922993540.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b5db7e3f8dd---37652662282.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/adc1520bec68ed34c2c0d885c20c2bc7/55765059803.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/11743241294.pdfIn PDF document text
    • https://electroagro.es/pub/files/vuzogitiwadedetofojider.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04b3aa1436---32157751194.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100448a0d910---17279039213.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/pujudizuraluxujabebajuzer.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/lebinamelokewijejugabab.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/vipaxitoledusurav.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c1588157c---wasugozikowopelefaf.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/76126544362.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/19eb65c9556e2ea68e5b11959bfed7fb/zosunaxoriwezefu.pdfIn PDF document text
    • https://pindimana.in/uploads/file/18193430286.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_off0000e5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DC 17852 bytes
SHA-256: 56af48f2d2478fc8c5c1fe0b6fe5182b1c51cc84ea8d33271ad60272b0550efa
font_01_sfnt_off000113fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FA 10288 bytes
SHA-256: 0e0a8e15cc28f5e4b5704f47f24a5d375ea26f12229a878431f55fea8c06db4d
font_02_sfnt_off00012b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.