Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc240bf56733903e…

MALICIOUS

PDF

85.1 KB Created: 2021-08-14 00:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d049f5b942a0f376f2110ae0d1cd437e SHA-1: ca6f4e4649d2eb3dcc68d44ba2caada8bb40199a SHA-256: fc240bf56733903ebd5cc65297daf9e9ed23eddcc6c2413305544822ff2d2b85
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on domains associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users into downloading further malicious content or engaging in phishing activities. No scripts were extracted, but the structure itself is designed to facilitate the distribution of malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://fotobolfestmeny.hu/mvc/userfiles/file/73161176571.pdf In PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/81013206801.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/5988897554.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c737dad143---6381810130.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b29c2e977---gimadojosovasubukix.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160beef3b3e42e---55133824116.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/4e61c05f142c6d694b21fb5b03051cf8/18063740653.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/robalakot.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/a9no0e68jnbfii9v5156ndvri4/losiwigar.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/xomudutewaxuxejuseb.pdfIn PDF document text
    • http://slsnn.ru/content/file/nofurinulefebejatemetaj.pdfIn PDF document text
    • https://rjpexport.com/files/gujowidegadol.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14e9a3fcfb---mitinuru.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/50cbbe1eee5f1dfaa9bb68b22df19d3d/rifajazifadevepumaper.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/2d57f81698752c4e3c11a97c9b264ba9/suxup.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/00c2da2bb255d0c4e3710cf99177f7d3/28123703541.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fedc6ecb5---31404650418.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/dodenitimo.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/bewivapazaramonekud.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610acc641c70c---molujim.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/66747492252.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/remudinasixezedikolutu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/tikevosekunudoxuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=kannana+kanne+female+version+ringtone+mp3+free+downloadPDF 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_off0000e745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE745 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF57 17300 bytes
SHA-256: 7fdbd862a61347c58f5bdccff663cf096ee747be85b846bd7ca91d0caa74e163
font_02_sfnt_off00012c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2C 11248 bytes
SHA-256: 850cd655cb699245b8091dcf8c8df5b0671898813f58b8e2534f0c0b2f2021fa

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