Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7adab5a0921e355…

MALICIOUS

PDF

80.4 KB Created: 2021-09-15 19:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e82da9e93a8635de37956c003e074d3d SHA-1: d347d0da8d83c04812619959f6be37420ef0f38a SHA-256: f7adab5a0921e35581445de1a0cdad1967cddf54b5c8ae4f90c2df84c28e1339
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript suggests an attempt to execute malicious code or further obfuscate the redirection process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://infrive.ru/uplcv?utm_term=old+phone+receiving+text+messages+android PDF link annotation
    • http://sanalights.com/admin/admin/uploadfiles/file/xogaxejopu.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/ditebusawozawefivaka.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d06211f47---46428470180.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/86929344461.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/74235508019.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/84836d124d69606113e111d1aaafa228/kexuwubero.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/595396f3940ff1077f9f74193acbb1c6/mupulerij.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/lugutegerekuvosiwozuf.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/6223215699.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210905155146_980833588.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/27007933939.pdfIn PDF document text
    • http://gerocuki.hu/user/file/wapasejupi.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/27524521437.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/morade.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/makuruf.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/xufidobufut.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210912114517.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/joferelujodisutafadupux.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/67717317827.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/37856947332.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/83523088110.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/fuvavubelowif.pdfIn PDF document text
    • 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_off0000d4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D9 17852 bytes
SHA-256: 249cd56be057d055bfade32f4fbe8086328f95285f90f0cfdf7875b6a393f623
font_01_sfnt_off00010293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10293 11156 bytes
SHA-256: 95ce955d4a8f5b20ca2b2008c8c9ac882c779da4da945899fc5806b53f3ca624
font_02_sfnt_off00011c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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