Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2ccc8df8d554c3…

MALICIOUS

PDF

68.8 KB Created: 2021-06-14 23:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7c8afecc49829989a882d21bf57bb27a SHA-1: 07538e7a276b478d96e4edf80383d57e6ef15a01 SHA-256: 8c2ccc8df8d554c35ba8fa681b2aed66fa287bb12f416d5289cfc463f3acb217
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=street+fighter+2+guile PDF link annotation
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/e617cd3eef88d40c78accb298a607fb5/93682065352.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210517214728.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/lakikamukugirudebexiwimik.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/66406372640.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/6nom5vlp76jdb3mdhtqkkdi1en/60877141768.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/um05kcjq0udpsl9f1qmc0sr8rd/84084718003.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/walodafiv.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/loo4t59u99tasr9l1epra90dn6/26672762831.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/q1do4qbq1d2ml6p4gif7csqikb/65418046417.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/ddc2d81458db5cfcfd70ade5cc3fdbb2/88753205693.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ce5fb90fb---wutupemoburim.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/xekafafesodojixepu.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021060521453773499.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a238ac86d05---rananegemuje.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/7cad842cd7c32215bde84a994cb1c080/jiduwedoduselupariju.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/768ef4568b94f8d4f258d69ce9c0a551/97879403610.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AA 4876 bytes
SHA-256: 125c085f8a4bd297ab466abb8f3ae5431113c82be14ae0cce87ce8545d442cad
font_01_sfnt_off0000e345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE345 10356 bytes
SHA-256: d27321a3562c3a6ff8dbe50c9ba95bd77f1bd2ce9f732983dbd0c31f7499754f