Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab079587c257e4e…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 04:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aacd03546870161d42cc53f3b6b4aafa SHA-1: bf34020c8ef6f611c9ae66a136f1764e6dd044d8 SHA-256: cab079587c257e4e9cc01aed165a948ff5382bf3264c836211c01007745e06a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farm heuristics indicates an attempt to direct users to potentially malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=play+fortnite+online+free+no+download+unblocked PDF link annotation
    • http://ellev.fr/upload/files/zerumu.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090207494821.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/lepotazu.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021091403322980554.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/85344092246.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/3c0e3e726830111f5280f0ee4e0db017/35836356147.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614686211756b---kademifutelapilumom.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/lixatimabefapanasita.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/ad29b39fb965daa17ad58494856ba077/55450368655.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/13250988142.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/wurosulukukadonixelureki.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/50936230296.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdbca8cd6d---mixaripe.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/wuxafogup.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/92757667016.pdfIn PDF document text
    • http://attlas.center/userfiles/file/zutivimubexotifodomejajop.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109091124097761.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614180079bfd3---90835452399.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/94317751427.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/loripufugikimabasupori.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/698fbb58091817798aeee6cc87c2d988/pamokuxa.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/13600533435.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/26678399697.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_off0000dede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDE 17748 bytes
SHA-256: 30b98b1e6fc6ae8cf133287a36df838a8c6970eab872c93c52c80ebaac27efe9
font_01_sfnt_off00010c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B0 10832 bytes
SHA-256: dfecf521cdfc7f8250b73ced24fa7882d836a690da28bd34d068c0f8c7ab41ca

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