Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca5ced7bca270d7…

MALICIOUS

PDF

84.0 KB Created: 2021-09-23 16:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bf63c97b0d9f883e427c8d44bdb1d0cc SHA-1: 24e22a19b0606c075c07a8aebb10d6cfd198dc63 SHA-256: cca5ced7bca270d7e45de4f029e3de5a670bfcd7e050177b7cf7a74570e02d8f
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and multiple external URIs, many of which point to compromised or disposable hosting. The heuristic firings indicate it functions as a link farm, attempting to trick users into downloading files by masquerading as a game mod download. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=free+download+among+us+mod+apk PDF link annotation
    • https://thietbixanh.net/uploads/files/88627344541.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/95627639180.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/muxivan.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/52919952340.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/guligidolijizivos.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/doremulepi.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/79rqbl69q15i6qnqk9rjinc7i8/89392230538.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/36083319717.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/63956977147.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/47498593064.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/44959968195.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614806e591775---75550577390.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/wixixu.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/91631097184.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/29629335878.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/vokazemimobetodudizajosul.pdfIn PDF document text
    • https://podimercrm.com/img/files/bugobenebu.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/21849160221.pdfIn PDF document text
    • http://platcometals.com/images/file/pekelifofasanoreki.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/nelutatoripamexakuje.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/120bed268ed6966cfa5c4fac18b8316b/14771026769.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/zuvilutulofu.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/50757273566.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_off0000e129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE129 18916 bytes
SHA-256: a65b3f0b1046a5c477e401d3ec21c6953814e18c006a47855d47478d5101d4bc
font_01_sfnt_off000111db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DB 10800 bytes
SHA-256: aa021c067d0f41a5b1478228cb30bb65b7ce13105ec35598bbe674b8f1722ac8
font_02_sfnt_off00012a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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