Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6e4a5711ce466a3…

MALICIOUS

PDF

76.9 KB Created: 2021-09-26 16:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7ae1f443bb4d44378118cd5c53f359ae SHA-1: f77f57e0faacd693d71480b621fd2820e3106663 SHA-256: c6e4a5711ce466a315647d39ab7886fb919c8c08ffd38f45fda86114759d8428
156 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 compromised or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns align with common tactics for distributing malicious payloads or leading users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8130eddd1---gekajivolidodofujiwemul.pdf In PDF document text
    • https://juhaszautovill.hu/userfiles/file/kexefenimimalukag.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/61625717663.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/1376959434.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/42275034269.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/31976654219.pdfIn PDF document text
    • http://eternoohydro.com/d/files/lugozonuruzoboferokasife.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/lowev.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/giwito.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/f720ebcdfe71ad343d47d7752629c73b/46465642460.pdfIn PDF document text
    • http://catwalkexotique.com/userfiles/68994517384.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/34023849101.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/2r4ufkfgpv8apjg6v4lk9v6m96/pixogi.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a8a1b98a4---45429435315.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/77238894207.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/xevemudimaku.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/45702127360.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/kumebive.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/90745851283.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/5670407795.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/88072408869.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/47991223165.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/44836838558.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/timupotiwexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=email+356+loginPDF 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_off0000c274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA86 19392 bytes
SHA-256: 9aca45dc1a9a6edf260e22d12bb84ea0573b93956918a4c087ddc243b06c2de4
font_02_sfnt_off00010d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D36 10408 bytes
SHA-256: e3b1a29b1b0a09501694f88e93febd4a14bc899643207d1c4cd9e301fd43c6b5