Malicious PDF — malware analysis report

Static analysis result for SHA-256 a31ff8b6eb96c408…

MALICIOUS

PDF

86.1 KB Created: 2021-09-16 15:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7617c4ba69e5625ab55b265669ff0102 SHA-1: 9fee135c2a4cdc106f35050db22d50fc691c4e96 SHA-256: a31ff8b6eb96c4087b25fb23129263dd26de130ef8f6bcb051dd2b5cefcb89ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple compromised websites, likely to facilitate the download of a secondary payload. The presence of numerous unknown URLs associated with compromised CMS uploads further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://aliguoriarchitetto.eu/userfiles/files/42863153577.pdf In PDF document text
    • http://accapierre.it/userfiles/files/44528324200.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/21920305246.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130300ca815f---nogutarosipozi.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210913_B3F80CA3F297F03A.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf602973c0---26866559027.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/zulalosuwutud.pdfIn PDF document text
    • http://boldogelet.hu/media/masabiketakexefasijiwefa.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613383a631e54.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/57085575036.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210907232531.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/5333231cb02411131f6aab2ad8d3bc21/87427261860.pdfIn PDF document text
    • https://maisonforville.be/documents/file/50156371286.pdfIn PDF document text
    • https://posh.hr/files/vuduge.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/rurotevekuxenawilibubu.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/87571768283.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/wuwidiwumigife.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/57545294313.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/48651977110.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16136fee69d3b7---51573934471.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/25408035804.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/1005185966130ec5c02931.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c555a11cc---4588727947.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/84491131360.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/14054021572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=m3u+iptv+playlist+freePDF 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_off0000eb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8B 10572 bytes
SHA-256: 80b611637140295d7455428a2e793e0e7561a3e67a4028cec829db1449d14871
font_01_sfnt_off000103e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF8 18108 bytes
SHA-256: c711c8b9d60fce17b9c6d9093a91321f0a003e7059b4230058cbe7c1d63a5552

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