Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fbbef74e9db7332…

MALICIOUS

PDF

93.9 KB Created: 2021-08-01 18:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 065917bb91590ca0a12cfef5ea27f1cd SHA-1: 4fbc8bd8a13cf00ffe23a5235edfbc44d2704d41 SHA-256: 8fbbef74e9db7332052a671374e8219f8958bced492f2b57a67bbbabfd052691
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The PDF structure and link farm characteristics align with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160995536df486---17153815383.pdf In PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/suwaxixikupemabumokedub.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac03457d51e---jixekabewi.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/182670030960908be67a143.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070afc01a440---vizimekixazutumogumeb.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/1cc8e595506f7463c513238a3bf3f9e8.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/foperesawigaz.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/78609515867.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/mimizizokevanupepage.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/fovofuja.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ace2e497b83---medozugedekidakifaduz.pdfIn PDF document text
    • https://airshow-bg.com/file/68357804068.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/ebf1be5aa6a86816b5b340e8170880a4/50574792691.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/zimonenezo.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/5322032869.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/40781897472.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9cf9751fc---71713354055.pdfIn PDF document text
    • https://ancoraeducacion.com/images/32620944154.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/85d64e8ed8f442f52ee3a8cf17902f14/gobewozolatudini.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/37346974401.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/lonazafosusovoxemusages.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e40486b158d---1508282387.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e30ea950df---wedolokajetopimivaxurireg.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f95dff6c5d6---33688763216.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/69317634476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+do+i+set+up+my+sharp+smart+tvPDF 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_off00010be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE6 16972 bytes
SHA-256: cedc990bfa33d3a8f01915a4703f2d86690e6e556e4ec061c03bf6dc85a661aa
font_01_sfnt_off000137cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE3 10864 bytes
SHA-256: 45d439ab57126cd0550a1f5c6d7b3d4e7d99e423cd2367af36613bb7c9b095f7