Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc17083618bc6be…

MALICIOUS

PDF

78.6 KB Created: 2021-06-13 23:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1e0614fa23e9ee8ad6fe2b39f91c28cb SHA-1: 5debc648cd0357fc33176620a2cb7521c294ee68 SHA-256: 8dc17083618bc6be5fd267e43caf445410d59e7b054d24baa981782ff3b3e0d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous compromised websites, likely to trick users into downloading a game. The document body contains garbled text and references to 'amazing spider man 1 pc game download', reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crewmak.ru/uplcv?utm_term=amazing+spider+man+1+pc+game+download PDF link annotation
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/qku78f42l6hddamilq2picmeu5/4202009002.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/xiliwul.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b00a8ee6a---vapomineborago.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/caef9e938c03ac432dbef03b88987705/kuzufawomamoli.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/90764970979.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/12c618d9fb93b95a0bb88fc788a7390d/8631908447.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/kidesukukobubade.pdfIn PDF document text
    • https://atl-50.com/files/file/rirobaguwewafoj.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/3qc78dme660uu611mdn6oen5ep/lugupawog.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aee8e0bd7c4---50759191479.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/24159720957.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/b26bb1578a02f4fd68cc5a37e2e9ff41/19413379354.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/970c3258206e49fc63bcb2b14515cd0b/47804910619.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/e3a7e034330f1afd5e5db85849820800/lijutukuzebezulaweka.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/d19eb52cac9879e7e57587c959195d8e/lijizenofisedomuve.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/7f8a6990fc0eba3346778d5e5474d28b/kuzozis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A0 5284 bytes
SHA-256: 9635eef2322b5f8ac230cae4053e7d5b5aa3f3e2e386114931aeabeef2f25804
font_01_sfnt_off0000fb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB88 10464 bytes
SHA-256: ab7cef669602534f0f72276e6118c3faeb6d3d4f9551eeaec5f59100b76e4790
font_02_sfnt_off00011f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F52 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2