Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e9247c6c9444dbb…

MALICIOUS

PDF

84.8 KB Created: 2021-09-21 20:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 903870fe0cb98e4da023699e96856f20 SHA-1: 9cdf6641c89f7f994ae4b16069850c5d9bd68672 SHA-256: 7e9247c6c9444dbb8360cb403816853b658ad3edf533da7f14c91f31d2518d51
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, designed to act as a link farm. The embedded JavaScript stream and the nature of the URLs suggest an attempt to redirect users to sites offering software cracks or patches, which is a common lure for malware distribution. The ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://huntic.ru/uplcv?utm_term=photoshop+cc+2018+patch PDF link annotation
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/guzaleduvesasovofuf.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/41880463036.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614661ceefe70---wozotatozebodo.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/74388668370.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/bedos.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/77287465015.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/sbo40beqg3nor07eskholi9lk6/89568249168.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/23214353550.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/jexixijepojewozam.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/56838681405.pdfIn PDF document text
    • http://seritour.com/rsm/files/palevemapegov.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/kokodalizatafewojuzu.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/tovasimuwafolani.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed91a82a5c---80504502562.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/gafawidaxojeles.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/40153765908.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ce96c34df---82405501037.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/xugijenanapuwasu.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/99db0b5b049f5d993459e97afc749c70/67744212796.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d4cf1dcef---84717491198.pdfIn PDF document text
    • http://ktcz.eu/files/files/54852586299.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/folebonumu.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_off0000e5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEF 10500 bytes
SHA-256: c1c5814b1de071794fffd549bab3702d3a68244a075d35752878b16ff3834328
font_02_sfnt_off00011610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11610 18232 bytes
SHA-256: aac28a31a35adac1de54e688820d8d7834f0b5ce04ac2f4a51ab4fcc02b04a7b

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