Malicious PDF — malware analysis report

Static analysis result for SHA-256 088b3490131a17da…

MALICIOUS

PDF

82.1 KB Created: 2021-09-07 01:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0e3e6106bad3e80abe625b8b47237c0d SHA-1: 427744537b949e3d6a9ce4921d497cff3f142c61 SHA-256: 088b3490131a17daa9b6433f3d5b94efd5c932385f0ea7176dcf327fc5ce7b1d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or trojan delivery via the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://irlanc.ru/uplcv?utm_term=schema+ampli+audio+a+transistor+pdf PDF link annotation
    • http://mirutte.com/newsfiles/files/regofi.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/sozav.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/77603004463.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/dukar.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/bibenopovegafedoriv.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/sowuluzefovokewijofo.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/61385238535.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/3631240501.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/22235137612.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/5eff838f2be974b4e2d32f61a07a2c0c/suwemun.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2ec15c0c1---jopedanupofojitelututas.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b536b906ec1---jobamopisutememe.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/ledokiwas.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611512643b726---zotuwamukulupazotis.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/e36fa7545bc9b548f0c09562445653a2/gisafakisunomu.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdf30b2bf3---noxekubixovugiwowevagu.pdfIn PDF document text
    • http://santeh.md/img/files/guxesoz.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/69355376308.pdfIn PDF document text
    • http://slippersymposium.com/clients/875641/File/44786847520.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/doxizefifete.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/sa6o8dpd72gse3b4nbki7k08ht/kepalaxuw.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/wosevonogafadutifoxujag.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/79221064904.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611374eb96337---93559184771.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_off0000d8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D1 18520 bytes
SHA-256: dc89d76d2c2f2d303b40ceb1e94d2089250fb356dfba96ad9a4654e41f316717
font_01_sfnt_off00010914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10914 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001212b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212B 11060 bytes
SHA-256: 79e63a9099afa56c6ef67665d3711b3db90473bd3419109a3afc83d4a9764387

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