Malicious PDF — malware analysis report

Static analysis result for SHA-256 e324ba1d0cfb425f…

MALICIOUS

PDF

74.0 KB Created: 2021-09-19 22:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fe9f9a98fe84c5ce1145c2f329ebae80 SHA-1: 1315687450173b8e237c70f7c7b1d037b41d63cf SHA-256: e324ba1d0cfb425f5d9c90b46d26c837e25421b8bde9c9cc9722e654033f8085
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS upload directories or disposable hosting, suggesting an attempt to obscure the final destination. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

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://bevasilicones.in/userfiles/file/namemupuvedulifake.pdf In PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161452c090885a---62099673804.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/pibuzuzefezezabi.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091319224983.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/64524354404.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/borutesituparisex.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/47207332205.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/mojelujulorisabokugurobal.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/7156889236.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109050019005443.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/13601394660.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130da2657518---sikanovitu.pdfIn PDF document text
    • http://pi-consulting.ch/download/47985321695.pdfIn PDF document text
    • https://webhosting4.net/media/file/45048152852.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/4d1e3eca0bfb9cf02614708214784722/79131130804.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/dbc2d06496bd8ad877b0defe73d4e8f6/ziletagabopapifewulavapok.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba76f23b16---25176659624.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c8393cdbc---12696192790.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/83282064182.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/vejenab.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614146bfae1e4---mufadovuresupulimuvafok.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/93291264191.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/4fbcb94464c80f9c1e8a69254cd08a10/61597452338.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/mesabukefadafewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=instant+rate+of+changePDF 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_off0000bfe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE8 16536 bytes
SHA-256: 2c423c6d912683caa5eacde18686b24610e1509ce04b9b37b8c96c64bfa42482
font_01_sfnt_off0000eacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E2 10428 bytes
SHA-256: 954462aaabfb54d559f9948efa55ccc6b2f60db18485b32b3e87355004144a6d

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