Malicious PDF — malware analysis report

Static analysis result for SHA-256 57131a39138752ab…

MALICIOUS

PDF

83.5 KB Created: 2021-09-17 14:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3e53b00aa2c0c9c81f4de8c8f7f0a46a SHA-1: b1df6fdbc237a96e763acba9705656c94d5cb1c9 SHA-256: 57131a39138752abe3382390fd339ebc81f449c22353e7ed677a96c07f53dddd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript is likely used to facilitate redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://mebelihome.ru/upload_picture/zidup.pdf In PDF document text
    • https://fultoys.com/userfiles/92446329437.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613953840765f---wutuzironivevezigoxuzaza.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///riregagifobowarewop.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/36305230579.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/2138979890.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16134c37b2985e---49609317944.pdfIn PDF document text
    • http://gibisch.org/files/files/sisibomamalagesigenivokis.pdfIn PDF document text
    • http://client.diffuse.info/files/mavikan.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/rafefogejamugoluluwexiwa.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/9985117321.pdfIn PDF document text
    • https://anup.bo/images/files/gowupuveduzivunelota.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/16763408119.pdfIn PDF document text
    • http://yuha.be/_files/file/gujifamamanurokigorajenu.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7f8578b4c---warefibepamiwilebuzigisiz.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/tufowujebobo.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/sasabanepezomesufi.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/79338490327.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2109110755316149961hg1nr.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/nubog.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/xapopelagasutu.pdfIn PDF document text
    • http://storemisr.com/uploads/files/2607388147.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/lemekamezubezufewojazaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=oneplus+one+android+versionPDF 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_off0000e253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE253 10476 bytes
SHA-256: c5bcf3257f29e45f4a510a31c58394c40966d7de68cdde5426bd075472504e52
font_01_sfnt_off0000fa38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA38 17700 bytes
SHA-256: 6b448c907aed8e3c7fd7d78049681306c2ac719c336a77406a54a8d09eb4e325
font_02_sfnt_off00012831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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