Malicious PDF — malware analysis report

Static analysis result for SHA-256 564076494e4a6e3e…

MALICIOUS

PDF

75.5 KB Created: 2021-09-14 23:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b62b91628592f5eb0f3761a00bf4e2e SHA-1: 26fa93d467e71db4a2396472b20844fde6939dfb SHA-256: 564076494e4a6e3e5c04fd82f89e23718b4cd1443c4836871ed6d217ed2df854
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The presence of JavaScript suggests potential for further malicious actions, such as downloading additional payloads or redirecting users to phishing sites. The link farm structure is a common tactic for distributing malware or facilitating phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdf911703f---burixosizizakumozelani.pdf In PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/jirukolezivox.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210910231726_dbryxx.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ace768d7db---jinededupovojegugazexi.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/82379413728.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-6/20210906223325971286.pdfIn PDF document text
    • http://greenld.com/userfiles/65875574722.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce44c453b0---tegevo.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/gogoribavidipakirabi.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/64044073590.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77056787809.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/39530281232.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/55694565901.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202191214799518.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210912102743.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109100910507246.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/pojazimatezukaxageri.pdfIn PDF document text
    • http://cissi.it/userfiles/files/pabufijudijak.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/fesulebewarozujiso.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210913184839.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/78182440065.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/jufiv.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/91532404493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=r6+free+codesPDF 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_off0000c43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC52 10180 bytes
SHA-256: 42195b47e2fe3bce671c290782a0a112a64a83d4c5b68123eb885bc025da7a36
font_02_sfnt_off0000f342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF342 17312 bytes
SHA-256: f0ecc80a4682c45b3b62259149bc33a63986fcf7312bc49206c3e6fa38b0b932

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