Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6479c412769a522…

MALICIOUS

PDF

68.2 KB Created: 2021-10-01 07:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3122bec48850efb276ed65a2808884f0 SHA-1: 04dcc9cbc1959274dcf3148a95d8464f5f9cccf4 SHA-256: e6479c412769a5222bb1b2eb96c2017f81716c5e5a78de77c1b3200df7e7cb94
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=ppsspp+32+bit+windows+7
    • https://kawanmto.com/contents/files/betemopewu.pdf
    • http://dolphinegypt.net/userfiles/file/nimej.pdf
    • https://amatnieks.com/pictures/image/94999977754.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/a1986098ddd801266dea988f7f81531f/lazoxojaremenu.pdf
    • http://multiflex.ru/userfiles/file/87134673181.pdf
    • http://roberthalasz.eu/uploads/file/kerelawuj.pdf
    • https://cyberbirddog.com/userfiles/files/rupadetefowuw.pdf
    • http://palenice.net/obrazky_clanky/file/71955196498.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4880669b9---68212904402.pdf
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/fowova.pdf
    • https://tidurmalam2.com/contents/files/tutizemozadiwuges.pdf
    • https://tennis94.fr/img/pics/files/37273312018.pdf
    • https://dbhattacharjee.com/ckfinder/userfiles/files/56591014066.pdf
    • http://veszpremlizards.hu/_user/file/nadititukutimijasubu.pdf
    • http://gaishachuukobuhin.com/js/upload/files/43951167933.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/f5295f2f1f9d457b4ea60558149dfd64/sokol.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/1g06b5kfqq8qr9qi54d04ld1d5/75390719234.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155d1f9d7529---mirixapatekuwo.pdf
    • http://k12kos.com/ckfinder/userfiles/files/pukutitijapijepe.pdf
    • http://aaaexpressac.com/userfiles/file/penofas.pdf
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/23463479715.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000acee.bin
20441861ee65f4dcd2bd831d40a2a55f9ad5d5e5bbb210536285f2a530a5baa3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACEE 15432 bytes
font_01_sfnt_off0000d3cf.bin
e69bb342f64a3e19a43d59c5a2ff8fea55c033c25c99f6e247da6bb2d6629368		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CF 10512 bytes
font_02_sfnt_off0000ebce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCE 16792 bytes

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