Malicious PDF — malware analysis report

Static analysis result for SHA-256 05197c972710a4f5…

MALICIOUS

PDF

81.2 KB Created: 2021-09-15 22:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5a0a572f7920c5833dc4be1ac762330e SHA-1: 603fc3765e33591656ebd5acabe56f8ea96bc38b SHA-256: 05197c972710a4f5e9e42148a1ca7ca15c00eec02c295c396932d47a42f2e56a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and a significant number of links, many pointing to compromised WordPress sites. These links appear to be part of a link farm designed to redirect users to download files, indicated by the 'utm_term=download' parameter in one of the URLs. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://gornjastubica.hr/files/mivuwaxiroweledoletoruja.pdf In PDF document text
    • https://qkon.ca/images/file/digigudoxa.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/74155636198.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/kikasowavebodilifupafafuw.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/jibuvovugotifasojukurafax.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/grf1pg99l6uiq7nr3s3odse7tl/wofamu.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/10567319315.pdfIn PDF document text
    • https://olterus.info/contents/files/lowazomosubaguwi.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/gemuvul.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/96479313938.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/wumidutelorimel.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/953b1a070dea89f018e5f71b66e1fab0/jisiruruleselajesegikes.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342d3dbddf1---zoralamuwazebomifaturo.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/jubikiwajiva.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/69887526.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/37177415962.pdfIn PDF document text
    • https://beaszemin.com/files/sorutadarot.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/11627544043.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/xamege.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/6k05a7hmr0r6dd6hoco256r3h2/dinabi.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bc35c8bde---gajivikasoderip.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335533ac419---12213319722.pdfIn PDF document text
    • http://attlas.center/userfiles/file/84658132350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=download+google+play+store+apk+for+windows+8PDF 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_off0000da17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA17 16756 bytes
SHA-256: 5daa4d44236d3c440e63bab804e3df55a279d57485af1deb322ca4fa4e1612ac
font_01_sfnt_off0001053d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053D 11176 bytes
SHA-256: 910b91682a142ec8d9411e08e89731ac3949a083aeee894060fa4fdf046a6540
font_02_sfnt_off00011f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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