Malicious PDF — malware analysis report

Static analysis result for SHA-256 107639ba012ed2d1…

MALICIOUS

PDF

82.8 KB Created: 2021-07-01 20:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d57bc51e45cf444089e7dbe2dfc61cbc SHA-1: f02e149c6cc605f8835a4f86a7b24e8d2738fb8b SHA-256: 107639ba012ed2d19bfb9d2b774b9e22fd9c6d069fc0d7d4bc2aa3602dc4e3b1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload storage, suggesting an attempt to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs supports a phishing or redirection attack pattern. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://artospace.com/pics/file/79324769715.pdf In PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2224d29d9e---debuf.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/mj1q3pu76l30flhdst94tam8h2/50405302057.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/t2k1bg4pds8i13s7s6gckg4s47/90062311763.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/dakotenorajufaj.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f101e48519---zewasuxita.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/10485080485.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/li3aebmrnnea70gs9d6chbh36c/47665166805.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/4f30f2fc01431619b86795f945ec297e/zowifulawazanelujelemo.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/bokala.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160ad01e91c8b4---24457730265.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c73cb1bde---daduzudugedozoloxosu.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc5e081b32---10350800681.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210505084626.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608598e7ef3b1---nijutozog.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/16486746524.pdfIn PDF document text
    • http://ximangsongthao.com/app/webroot/uploads/files/rufet.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/4d00836fb936cbaa75c78c61ac5b35da/zegosorelofomozedilim.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/15478542347.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/visofomiwawafopegipif.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/efa896f1b9378351fb6113a626b04398/lazisenekuwagobib.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/3854871388.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/54249199532.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/14838281290.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608491bb6d066---90448802748.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/zupawibifidaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=glycemic+index+chartPDF 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_off0000dfff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFF 16840 bytes
SHA-256: f5d5aa69c287eb0a6a248e6f21e9ad6cbded481c8d2b7029e8b55fb3bfe09230
font_01_sfnt_off00010c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C53 10604 bytes
SHA-256: 583a36eef118afff35741a4627d6b720dc3e9cca3d3aa65a56a0c04f696ed129
font_02_sfnt_off0001245d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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