Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f2487f809a9bbb…

MALICIOUS

PDF

69.8 KB Created: 2021-10-02 17:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ff549a01973da382d3b53a2f75c9baae SHA-1: 6dcbb57f52a44ac713ef6f54bf98bca7fe1a9139 SHA-256: e6f2487f809a9bbb44cbc27233b08089881fd5fb702a54fa76f24cfe9242ce55
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm or redirection scheme. The ML classifier strongly indicates maliciousness, and the presence of multiple external links aligns with techniques used for phishing or distributing further malware. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://smidgel.ru/uplcv?utm_term=airforces+monthly+pdf PDF link annotation
    • http://club-integra.ru/userfiles/file/nomaga.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/e112adaa6c3923f6091f4bb28d5c7236/menulapufebapuxelem.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/3122891209.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/xizusevawajulizipururi.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109271816567354.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/20022677495.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/10780145444.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/27563376184.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/3afd23b0973ee019864ca3d7034c1ef8/53069461348.pdfIn PDF document text
    • http://cplust.com/upload/serback/files/20211002175759.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/difuzorofelawaluvi.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/radibasumavebolopobisek.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///78258222044.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/kepakenu.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/91324993933.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612edded17509---guxezudomajiri.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/22439707403.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/1843610829.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/kepuxuvalujosejaxepo.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/24617781699.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/lofipisavuwirijukel.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/deserenur.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/bigezitotubuje.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/63801094025.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/pegivodekumagitujabosu.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_off0000b446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB446 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5D 10820 bytes
SHA-256: 2105403492da83b58e1b41b26fb5735c4876777df1d7abc919e3022e15fbfe56
font_02_sfnt_off0000e51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51D 14800 bytes
SHA-256: aebcadd3976ecfa7b49af2e4382de60915dcdd9b3e04e3cdc2f3b5e386e4966a