Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6e041cbb7f4d33…

MALICIOUS

PDF

71.1 KB Created: 2021-09-24 19:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 86c96b68375358cacc233c01ee23246b SHA-1: 50d3840d9542c6f5c6d85927bf26edbf1b4f500a SHA-256: 9a6e041cbb7f4d335e1f82f50b1268662bc121cb52b1e108dc068eaf8cf31cbf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of 'LOLBin token sequence in document text' suggests potential execution of commands or scripts, likely to download and execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/c112cfb0bff52597e77b7cb7fa69a078/57152099118.pdf In PDF document text
    • http://vansuloi.com/uploads/userfiles/file/pezijebukojaravubijepo.pdfIn PDF document text
    • http://dsfly.com/uploads/files/63405891015.pdfIn PDF document text
    • https://naves.cz/res/file/2217679462.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/30650558977.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/mipap.pdfIn PDF document text
    • http://ladna.pl/user_images/file/69219344732.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/lulixogalojepurugo.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/deborejega.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/punuwef.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/vezovabitaredu.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/40662539134.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/4979393139.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/gudetulibadixedemow.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/xifosegoratewedaf.pdfIn macro / runtime command snippet
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/xenagefuzux.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/zular.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/nezutosor.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/17149235250.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143160c4b5f4---55552293712.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/90854123121.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f532cec2b---kerow.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/levodiwow.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/liremada.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/getasugomarulaseleder.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/ganuxabofezemikalud.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9ae42186e---wisegegokivagaxav.pdfIn PDF document text
    • http://www.neoneophytouIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=marketing+strategy+pdf+2020PDF 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_off0000b312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB312 10948 bytes
SHA-256: bc0df538f12e6dcdfa38d10c9cc4e123e38a8d3a58ceb419df33974ef8212429
font_01_sfnt_off0000cc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7B 16572 bytes
SHA-256: 01e9ce1340e96a2f141780840d4489ba0e379db9dbfc44404993a077fd1d79a6
font_02_sfnt_off0000f6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1