Malicious PDF — malware analysis report

Static analysis result for SHA-256 8229c3eaf411d732…

MALICIOUS

PDF

89.2 KB Created: 2021-08-13 20:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c60c98a32f260bfd24bc743f51ae01f9 SHA-1: 9df0f6fb5ec4f40dca7ad3aae5ee9a70f405047a SHA-256: 8229c3eaf411d73290f75ce195a9381e9f324f6c73270a293aa1742c39941588
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is used to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/00mfhj9q8d70h8lejha95vitu4/85561879333.pdf In PDF document text
    • http://21cedu.com/pds/userfiles/files/gamofujitakuxaj.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210619_24DDAA0784D5257E.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/n15mj1an0g45k99hdoeo5t5d5k/barapumubixijibupotamifes.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/52878771688.pdfIn PDF document text
    • http://newo.ru/files/files/15226218395.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/rejijonolasalarox.pdfIn PDF document text
    • http://texmet.pl/userimages/file/11808252953.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/62635457621.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/wuwux.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/pumasujugijumokupikedazo.pdfIn PDF document text
    • http://bowenworktimmins.com/clients/e/ed/ed750a77e36579213b976c45729ba45c/File/43451028081.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16111dd74e2439---43003222286.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/cln72d2jmlrs46m5fpdi1d45kl/98336343644.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/bexulebixizajupesu.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210723161957_eGV3aXRhcmVkaXZ1.pdfIn PDF document text
    • http://cocoal.com/uploads/file/5182927701.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610af3dea907e---wofekase.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/jamagatidataxato.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/78ea13e0c99e460d68e0de8d58596cca/zofumi.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/ferifen.pdfIn PDF document text
    • https://mmszke.hu/files/file/31908879435.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/0ec13d3e49df368c18c4718aed41e6c1/23531200931.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=last+day+on+earth+survival+tips+and+tricks+2019PDF 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_off0000f577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF577 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D89 17384 bytes
SHA-256: 74a043d9c45ec0d920a5b2e45e78e96d2718679fbbc8dc8d13d240d9c0168096
font_02_sfnt_off00013b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5F 11404 bytes
SHA-256: 8ac99dcdcaef3eeae9e0e16450b801792700d422893a232051b7f2a6ab72e89a