Malicious PDF — malware analysis report

Static analysis result for SHA-256 c69f1f92c836a67f…

MALICIOUS

PDF

85.8 KB Created: 2021-07-28 07:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bd4633edf0c007584960df5b0768de54 SHA-1: 3266de60e5653de8691f723e74270ce90e4fefe4 SHA-256: c69f1f92c836a67f50c2ff0d440e0523fd3696cfb54941b5655e55f10d6ddf5f
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs, many of which point to potentially compromised WordPress sites or disposable hosting, suggesting an attempt to distribute further malicious content or phishing lures. The PDF structure and embedded URLs strongly indicate a malicious intent to redirect users to external, untrusted resources.

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 http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0dff1f5e7---26882119756.pdf In PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/nujebumadasuzabodi.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/77862029575.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/palimedebodori.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e26a90d1c---dagonewumagi.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/c5a4a1f47777d514a8906ae98cb03260/rigumebazutobekudebotikib.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/ge3pn1gbkfmu7hirbsirl6fptk/52414580167.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/5900u96tf6tg3t4nkcr4tthi46/vubejibolobuwerezejusu.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/8453139051.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/84193282398.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cc6a47cea---79274684361.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/11414840214.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/87f21e1ffa49251a9053e307d5502a14/23133063135.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/9142704392.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/gnv5dlf78ld7ae2olq10b5u39h/54989300056.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/tazaxezopuxiraxu.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af867637e87---rekowipoxodosivexamiliwa.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b89798e3fa1---tetowokeribiti.pdfIn PDF document text
    • https://rotterdampools.com/contents//files/44214503749.pdfIn PDF document text
    • http://bruningfoundation.com/clients/9/99/99acc79c432c4c389b364f5b25189af3/File/24970857329.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/25981697092.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e4fdcba6ea88729cbf91c7d9305bcc33/bulakemudeliwuvegi.pdfIn PDF document text
    • http://emeat.ru/var/files/65780037095.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=nvs+class+6+2020+resultPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c152c5a3f3a---dopokiw.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_off0000ef16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF16 16380 bytes
SHA-256: 9f72c53343dcc49ccd014d26e8271bf094c4a02f7e715a905ac860730ad1a50e
font_01_sfnt_off00011989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11989 10460 bytes
SHA-256: 2dbd048b1035e6a13d458b1d5bf699ce3cff3635125333679f668e54ac5e3eca
font_02_sfnt_off0001319b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1