Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d663b71a749e471…

MALICIOUS

PDF

98.7 KB Created: 2021-09-20 02:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a734b3bf6dd28240eab8a559eff6d415 SHA-1: 4bfe66f761a1d6abf51865fcf28b35ee5e2fa276 SHA-256: 1d663b71a749e47156f2f70172d1527f4c9c3b57ad54f534fca106b561a963de
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to phishing or malware distribution sites. No scripts were extracted, and the document body was unreadable, but the extensive use of external links and the high ML score strongly indicate a malicious intent to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://casasholidays.com/scgtest/team-explore/uploads/files/13569472008.pdf In PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/xipubonobalofedib.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e51b1e913d---53666537222.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/24339782321.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/nuvenevukuvigigeteroxus.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210913_120246.pdfIn PDF document text
    • https://12shio3.com/contents/files/pisanezusewexap.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/80983180064.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/sopigibojerunilapogal.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/55081087669.pdfIn PDF document text
    • http://ortosprendimai.lt/userfiles/file/vojasumazuvakureweveza.pdfIn PDF document text
    • https://quangcaomattroi.com/uploads/news_file/xivawazisuvuk.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/55327282660.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/29e324c7ef0371a50cff4d63929e1987/gamiruvipi.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/31083273673.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/44394555018.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/4f308347404ea8b30b5b787df32e7e3b/loxopaj.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/24fbb51675c908f69839dffdecb71b77/dupubewitedapexawafike.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/17096776908.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/lekiposesumavez.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2e7922e929b61a7a91d6842608065fc7/xuvujuposuwovozoba.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/rimegatebogun.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/74852083272.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=demon+slayer+mugen+train+online+for+freePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001267c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267C 2180 bytes
SHA-256: 270ae547dc90e2207aa0a92c4c1a5bbf5c5d348c86bb178d5b8648ce7fc816c8
font_02_sfnt_off0001305f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305F 10772 bytes
SHA-256: b53c18735faaa101fcde79893c126f4bdfd54923c2e2bbfe43b94fe9334195d5
font_03_sfnt_off00014931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14931 19404 bytes
SHA-256: 890383b22efa1ae7b70749ae86e74ef9a4d4b6b3019d9f4cc891c67645c1db67

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