Malicious PDF — malware analysis report

Static analysis result for SHA-256 525dd9f61fbd928e…

MALICIOUS

PDF

71.5 KB Created: 2021-05-30 15:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00e2c3477435773becc7508302ce35cd SHA-1: 90687859b8b2683cc4d07136406c7af08ecc96ea SHA-256: 525dd9f61fbd928eafee3ef3deac2698b695832586e7b9c3ad50dfe27b7f182c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the nature of the links and the detection indicate the PDF is likely a lure for further malicious activity.

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://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989284ba571---54942635955.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/419b2719a46d777019b8977d99ea0b45/jewenabim.pdf
    • http://allprintusa.com/admin/images/file/36346708404.pdf
    • http://sevimticaret.net/userfiles/file/luxekuxedumobojazara.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e8bcba0f4---legelesopekuwasonet.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c1c7f647---6821436189.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608a59f86eecb---gawimajumizipana.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608969f49f83a---99059650036.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/ok6ih1citjba3t8et9slkvvu3q/wofasodepapizowekumejov.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/v7ta1g9o1meek32ll33rdi163r/dijeneraw.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a71546d3bf---1403887679.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/c534febd39440647b9b044942f50128b/marilodesosopomakib.pdf
    • http://banghaija.com/userfiles/file/pugasonirofujopofiziwos.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160796f408b4f2---8752204206.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe454dbffd---jenorefemegefexag.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bc578a5c1---buranananogidegeserufofa.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebf927772f---85642852842.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+write+a+grounded+theory+research+proposal
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcc9.bin
fcb0db0f7f773230be2a6380011c87a829391297416d8b18b627ff68dc5d1395
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC9 5488 bytes
font_01_sfnt_off0000ef86.bin
2a3c6146dcfdf9f23b1618d5ec25dcfcdf9dd5f3c505c263cc052fb59834f925
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF86 9604 bytes