Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fd7dafff9e9e015…

MALICIOUS

PDF

80.6 KB Created: 2021-09-10 17:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2ab73345af14e4ccbe2e62adf1f45c30 SHA-1: 0a3b61840e51854a7d854a36fd52f6834be3dc34 SHA-256: 2fd7dafff9e9e01554e17d3bc8f1da37aee47a868ead93aaf3f154cf6832c902
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm or distribution mechanism. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs suggests an attempt to redirect users to potentially harmful content. No scripts were extracted, but the structure and URL patterns are consistent with malware distribution or SEO abuse.

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://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe2a5a7aea---52434021931.pdf In PDF document text
    • http://hzdsbg.cn/uploadfile/1631245999.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/lamifabusebubonedupuj.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/misurabasub.pdfIn PDF document text
    • https://questyme.com/userfiles/file/19330323497.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef26b11609---komebetedomaxurilodegu.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/rarubajepuvosomuz.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/48429926577.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/26535989577.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/rutawinesejasevujamanaj.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/jatoserakedafa.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/teguguniwede.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/gowoxap.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/nodekugelugepexa.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/966359991.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/19521325605.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/64576557507.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/54314120335.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/vebifafigami.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/82594857769.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/57180939521.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/kumorufi.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16138a2b1b7815---84503081191.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/xesurugeteso.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/64072284738.pdfIn PDF document text
    • https://msvadba.ru/files/file/lobawuveluzopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=sat+chinese+practice+test+pdfPDF 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_off0000d6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B8 10624 bytes
SHA-256: 6579bd00d09989fa9405d22c85159ac755838ab6850455f025d2cfff96c6ca03
font_01_sfnt_off0000eef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF0 17692 bytes
SHA-256: 625d736aa263540cd2419359299b4003df02ebf346a340bf588b182d11540530
font_02_sfnt_off00011ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1