Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb5e5df8595e9d53…

MALICIOUS

PDF

80.1 KB Created: 2021-09-04 13:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6783255de6faf7cd65afed732103894c SHA-1: adabbd4e42dca7c4d294c47c8753ae11e6ce2274 SHA-256: fb5e5df8595e9d5322164007562c6c5347e3320b9d6534c8f7d645c051776c1d
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, many of which are hosted on compromised CMS upload directories or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://aeap.com.br/ckfinder/userfiles/files/bafiwura.pdf In PDF document text
    • http://canigrup.com/userfiles/file/33332172071.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d43775967ff---majoxap.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf6be0190---18754401425.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc49924d55---powavurusev.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/3729a78gi66cvi9jvdrh190ll4/jokijetodeloxi.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210825155839772699ug4hss.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/163aae3457fc8c7f5abc31e2f56c025b/45307274813.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/dexeku.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610346558a249---84963573012.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/lakukazodebekowewa.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9c22bc70a---33295710161.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/pojedimisavaf.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/56683569222.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/dilaxasizeriwiperesezile.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/falodo.pdfIn PDF document text
    • http://brukbet.com/user_images/file/subagaxofuvabazawijol.pdfIn PDF document text
    • http://dd-eng.com/files/files/wugojikir.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/45211029732.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d5b16244d---nofomunavafeved.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a61a0cdfecc0892703a49bc493ed9c27/62906693512.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/porodipusakus.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/30262649379.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=uv+spectroscopy+mcq+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_off0000d517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD517 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2E 10712 bytes
SHA-256: f9a111f070b055025f5f8857c4be710a393d0fefa28b08a523b0c3c4f1e9dd82
font_02_sfnt_off0001059e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059E 17652 bytes
SHA-256: 7918fb5ec0b7617cbb4fd5b1f41adf8d4f3cfe7505b3ebf1dcd867526619798b

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