Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6fe87b6bd9e7dea…

MALICIOUS

PDF

80.1 KB Created: 2021-08-01 07:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 439e046abcdc93fd2dc78515b1000e70 SHA-1: a1ee119943c12fef9624a02e3e3b49b6ba5213d7 SHA-256: d6fe87b6bd9e7dea343130564475902e1db507b76e8347d85e675592c10aa70c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking clear user-facing text but containing embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://weifong.tw/fckimages/file/63744360035.pdf In PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/11e47460a9943fe049f55565ec88fb1a/78311737741.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202107081534254742.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/432560b20433684daff86d08c8472fb6/raladagozos.pdfIn PDF document text
    • http://nktrading.qa/file/files/1188791583.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ac27811687f---83714856193.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/sa1rbqm11tte9iqs4md7mn42l4/sedidapino.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bef4a1170---bepozivimi.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071b71395323---pekiz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc7e25ddac---72379183096.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5983c260a7---16432118409.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4fa4e292f.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/f83c4a6866596bec659090a693bb5883/sebuzasolepuzolekoraki.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/3859de5fba7ee28e7aec7bccab410336/vugulemigopu.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/73541501135.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/64146856376.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/f2d3c5b150f39b694c69b9a6e2a0d395/25729790172.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/lovifuboko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=what+questions+do+they+ask+in+driving+test+irelandPDF 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_off0000d544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD544 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5B 11040 bytes
SHA-256: 0d24530ecdd3750a4efaf8827e3cf9076b3fa96bd1dfb1278600667c203f689e
font_02_sfnt_off0001068d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068D 16524 bytes
SHA-256: 318eaf7b22666b560cead4b393bc0303634fccbec6e8f4e9ecbb2be37d9848fa

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