Malicious PDF — malware analysis report

Static analysis result for SHA-256 86390897c93789dc…

MALICIOUS

PDF

139.7 KB Created: 2021-06-26 10:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0d2f6e9155b308c56542ce5e7cf22ff4 SHA-1: 6125ab4999189a6216f599208b5073c4a4e6c9af SHA-256: 86390897c93789dcf4f634b227b5d6db291f8c11eb7ffd3f32c16480e594b929
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://coretry.ru/uplcv?utm_term=remote+sensing+and+geographical+information+system+pdf PDF link annotation
    • http://thedewakohchang.com/image/upload/File/oloxibimikor.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/bbqju1tiqfgsvtvs3s2mi5q6lv/zevudiseri.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/nuxiwetemovez.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a256b3b41fc---lazokiwapi.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/34264056831.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/fijojazuwakekefatunufer.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/21183837871.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089775b50eff---fikezafab.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e75b74f733---56573316245.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/jakerexijusuden.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e38346214e---9710453661.pdfIn PDF document text
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082e50710903---fagunibagumeb.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210619_7A8FC78FE61F8D6A.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/iv8rq2nbcmpokr0bcrp706ojt3/15055787786.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/25162782943.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/rofixejuxopojawowedi.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/alnomiduc34lu6vp1rbdk5esjh/3166357433.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/zigelotugo.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608714fc65506---35755077772.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/73149538690.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/387583b2d9710147d4047671fdfd434a/kipupabofigevoruguvu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/xojilaxavatufekezam.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_off0001bcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCF4 11228 bytes
SHA-256: 348573c255c28171d1061b7ba244608568fb3bda2e97fe3c888a7c9341d27e64
font_01_sfnt_off0001d6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6DB 19336 bytes
SHA-256: 1e6d12ffcd91e35b8532e741e9a8b98cd34f01d58baf0e4d191c6a3714bd8b5e
font_02_sfnt_off00020919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20919 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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