Malicious PDF — malware analysis report

Static analysis result for SHA-256 1198ca43e12ab5bf…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 04:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fa90ea952c131ca1ec66f289a56707c4 SHA-1: 561e44d36c8f031577413ec77e974e504bc6c89c SHA-256: 1198ca43e12ab5bf1511eaa3191f697dc896d7fe4a0c1c5002df7d868d8d32a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting the user to one of the listed malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdd013d22f---85827322982.pdf In PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614327fb86c48---duzawibeminesaxe.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/92628849075.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/falupex.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/51154092995.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/96538578496.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/jatisoluzobad.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/4394509818.pdfIn PDF document text
    • https://zzwgjx.com/d/files/62943969693.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/fozuje.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/30095516153.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/sunalufimalefalofo.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/6346655546.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/7c730f725227a6d6e48ae8de73cdde62/bawilusesu.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/37815199962.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/nifexu.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/xixirivuzobaxu.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210908_61B4A2A5F1A67401.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/wupuzakuxat.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/6852071774.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+set+a+default+browser+on+androidPDF 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_off0000d97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97C 19088 bytes
SHA-256: 03e7eb38979d638a5fb14f6bd13b1eefa3c4b4f3bd0d4eedc4c281da3304efd0
font_01_sfnt_off00010aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B7 10664 bytes
SHA-256: f06930a87e36c0fe0bc1c92faef46094e567c4c572433f0362863a3a78316cff