Malicious PDF — malware analysis report

Static analysis result for SHA-256 e57fff3b5b0c5af5…

MALICIOUS

PDF

71.4 KB Created: 2021-09-02 07:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ad8073fdde6e6003fe60911ac8768765 SHA-1: aef7a9f5595ef361958f2a299b16b7591b9477dd SHA-256: e57fff3b5b0c5af55abc54bbfcfb4430c2b951ab7ff93e7bc9675eafa13e74e7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external links. Many of these links point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160a80a53bbba1---31950490778.pdf In PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/o3188j9n0ph5t7gpdjf5toitdm/tagedi.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/7ga1f57dolgb70cnk11lqksqv7/26742943443.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/gojagagu.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/mofez.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/98739040833.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c00a09d99---duvixa.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/f6d4573bc1aa02610d2edc3ffe8a3c7b/85774150857.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/70777202285.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/68246007333.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/saxubosefojesubuzom.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac356b3c104---68022882893.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28daa12b91---78190210678.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/nuxipetor.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210803211924.pdfIn PDF document text
    • https://ancoraeducacion.com/images/10581728664.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0816ea4eeb---wamolon.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862c3611eac---70908536480.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/886691be3c256b234c7246abf77597be/tarupegoboropewexodofak.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e7a097905b9---42332955355.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/gituletuper.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/64754035466.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/72604365453.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=mineralocorticoid+is+to+aldosterone+as+glucocorticoid+is+toPDF 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_off0000b7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C2 15496 bytes
SHA-256: d1886245797005bc1287ac24813caac665dabec7c53910d5e25ecb5b802ba446
font_01_sfnt_off0000deda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F1 10640 bytes
SHA-256: b5c632ba15f79629f79d76c5248ef7bf402be1ba2a5fc4280d71236b9fb1a5f8

Open this report in the interactive analyzer, or submit your own file for analysis.