Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb24be301177eec…

MALICIOUS

PDF

94.9 KB Created: 2021-09-04 17:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 40b4931655d54402eea047a28fd314e8 SHA-1: 0cabb89fa947cced7df22ed7b909b71d8c981da4 SHA-256: bfb24be301177eece45cb05b90852f9551b191d36cfcf9277ad5f9693a5a9ca7
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests an attempt to redirect the user to potentially harmful sites. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://aven.su/userfiles/file/xejimoluwidesil.pdf In PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/93812824009.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608100cd4d913---ridix.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/90602471443.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/185edf485468983445316b7483653980/wawemejagoseni.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/62059365125.pdfIn PDF document text
    • http://talleresjpg.es/img/file/kexarijafutarobij.pdfIn PDF document text
    • http://adveotec.com/img/file/80074726672.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210714_4DE15842E522DE6D.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/bimid.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210818060659.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/gabexujesogos.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/begipafenuvedekokemoli.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc343da1da---zelumusabutifi.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/d95436biecqlamlrh366cj9jk0/waxuzepudexumosekilasak.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/getumozitudox.pdfIn PDF document text
    • http://landpas.pl/upload/file/85418427934.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/43436738951.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/71511967819.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/42n5pqodekmam41svtdre6hog9/dakuzugunevafonumet.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/sisemi.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/58188956018.pdfIn PDF document text
    • http://calhi1977.com/clients/879053/File/52925620010.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ec2797d1f---kedoborazetar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=edit+pdf+di+foxit+readerPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE351 24276 bytes
SHA-256: e66af7f208e0ae7de3d68edf4b2364ec655044196c01f4989fc7a959b09de144
font_01_sfnt_off00012057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12057 16164 bytes
SHA-256: 9f01c725b0c71cee52e48ffde83f584038e4cb92a317dbca5d2245e74e2d6cb2
font_02_sfnt_off000135f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F1 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off00013dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DEE 10256 bytes
SHA-256: 1f3d83cf04361a9efa71b7d2d80f85744db4d966cadfbf5b6f3f4f6a357acb7f
font_04_sfnt_off00015519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15519 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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