Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0d42dea1387f9c4…

MALICIOUS

PDF

72.8 KB Created: 2021-08-28 14:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 015492492698aa5fa3c8e798eda02014 SHA-1: 1972003278e0ef7f4e1a04b8e6fb33016f6cbb86 SHA-256: f0d42dea1387f9c4dcd8a17b710baf528d9d08b2d370d5120f48c482ea87aee1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to compromised CMS upload directories. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to drive traffic to potentially malicious or compromised sites. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://mineraux-et-lithotherapie.fr/ckeditor/upload/files/romedodajupumos.pdf In PDF document text
    • https://lecourbe.dk/userfiles/file/buxemelalazuwew.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926ccd277d7---47270688638.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160747dcd54667---34024495029.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/79694571408.pdfIn PDF document text
    • http://jarosi.hu/files/file/14153631979.pdfIn PDF document text
    • http://derma-dts.de/files/file/65223289383.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/pulifo.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/bavatarakudiriviwib.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/rexedadob.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/7388035010.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/ninefirevokob.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/58459994333.pdfIn PDF document text
    • http://poiskvod.ru/images/file/jewotadiw.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/nujar.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/41813961553.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/vuraponotodizigivax.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080893a02728---53743034668.pdfIn PDF document text
    • https://ptogel2.com/contents//files/4966427381.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/tijav.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/21384513004.pdfIn PDF document text
    • http://teifsepahan.com/files/file/norire.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160759026b141d---95962875038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=stairway+to+heaven+1973+madison+square+gardenPDF 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_off0000b6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A0 16916 bytes
SHA-256: 0a2e459509358f73dcb608f1a8611120fd6963552b710cd3958f824e59f60ba9
font_01_sfnt_off0000e269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE269 11680 bytes
SHA-256: c15071061fb5160af6bd73edca98180d359ddafc3391608f9669389ee9d34594
font_02_sfnt_off0000fdba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1