Malicious PDF — malware analysis report

Static analysis result for SHA-256 be63f04569c7a57b…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 22:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f348b86bb515e8bffca42044f5c97dee SHA-1: 0161d514ce69dc978170d2adc1168a0a44facec7 SHA-256: be63f04569c7a57bffb012e65093178949f30e776f479b7e10c04e5d221657cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple domains, including compromised WordPress sites, designed to redirect users to download files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous URLs with 'utm_term=download' strongly suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://nomylo.ru/uplcv?utm_term=download+xbox+360+apk PDF link annotation
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/kudizosiwejisisu.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/6pj0a1jn18m9venu8c0bqd6vaa/51474718622.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/zasodewuvumi.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/vatobofefodefuvitaroku.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/10762663413.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/vsa4etokut3gjjh20aiao8esjb/dutunorudejuwijame.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161419d00f32cd---xukuregazap.pdfIn PDF document text
    • http://baove24h.org/upload/files/luzasolubo.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/vafopezefelam.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/49950030901.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347d7c1dc80---tajemoloreparefebizinig.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/28391330114.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132ab0862da3---gelezoboripirani.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/38076576567.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/62870305124.pdfIn PDF document text
    • http://tai-group.com/upload/files/gepeba.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139805d298fa---buvafo.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/71903794116.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/weregaxegajojisiva.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/timabupalobosuxufaneg.pdfIn PDF document text
    • http://jarosi.hu/files/file/kuxemujujitamekopuselase.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/81635580257.pdfIn PDF document text
    • http://effektfilm.de/files/file/40113523470.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_off0000db7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF395 10680 bytes
SHA-256: 33b1622cb27f0caf20d8fb69cc83cc555d67ff32e547e33ee0cfd4d3c4e8bc94
font_02_sfnt_off00010bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFB 18412 bytes
SHA-256: 3af85805dc8115f48d6eadc4bf238d70bc3211e38721a5ce129c05a5b7d84280

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