Malicious PDF — malware analysis report

Static analysis result for SHA-256 e910cac0deaa9a69…

MALICIOUS

PDF

80.8 KB Created: 2021-06-27 05:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6698f4179dac920e339a6f89ca5d4bba SHA-1: d0011bd4bed6a3d36f6e533b0a2231867a18a456 SHA-256: e910cac0deaa9a694a7e084a19fcb40e0860ff17045b7963d243ce95e7e0215c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or facilitate phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attack pattern involving redirection to malicious sites, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/f9e8764777c726debcbc86dd4f215ad2/kubozamugomiwunutamebo.pdf In PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/dbef6bcf00a4032cf8377c4dfb279cae/jofabuxosurazejuvame.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce68d72dab---67360683565.pdfIn PDF document text
    • https://medtek.vn/storage/file/47914701716.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2c096b9c3---37919105331.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/59229487990.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/gamutibaxojatanaliliz.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/2293984967.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/pls6scng19rnnpdi22hkn8oacl/52524746.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d55091e4ef---kamixikibag.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/94378830807.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/bujopazufifinuzufamuvuw.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/wiwazegunafakun.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/43002555358.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b968eb98950---winobaxipinizevix.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/durapuwaxob.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/o01p9tlr5tmfcoakqcp4s36n6q/48055477924.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/vabitipuwukafuzenevimuxaj.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/nizexufep.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa9f4a2bff---45028031841.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/69314541929.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/pezibetugafabiredidad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=golden+fish+and+chipsPDF 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_off0000da72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA72 16748 bytes
SHA-256: e9c983f097a1cfc3d3309736e59cbd902149fd6de12c2515cd7ea7d411e92df1
font_01_sfnt_off00010624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10624 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3B 10556 bytes
SHA-256: 4b8a40135d9556f9cc67a4a0b3485769b06efa7f7337eb8c2a3b2ea91315afb2

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