Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a07f58be8d4789…

MALICIOUS

PDF

80.9 KB Created: 2021-09-06 23:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 178f06154c676e7b677cd8a5309c66f9 SHA-1: 20bf123f52db68daf56bf87bd39ee6ed17933f94 SHA-256: b4a07f58be8d4789d2a2be42a89330c0d743ba2597e1209b56ce1a171f921510
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=jpg+to+pdf+converter+download+i+love+pdf PDF link annotation
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778847ce971---90388772717.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/dojuxawovonotuxameleke.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/c7715c15e5495bf17bee65b306ea39ee/3230493882.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/24425274998.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610ad20e3c6a7---81043878814.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/44755810611.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/41130534359.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/nonojefuwedaku.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/wexopurebevefowi.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dba664dbfe9---92323444704.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/monovenotavusi.pdfIn PDF document text
    • https://ranagro.com/files/naxudazokowexudubip.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/fd6da3415075625c0266704c5009e5be/99562551703.pdfIn PDF document text
    • https://mszukam.pl/dat//file/botuxoxovexawomamoj.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/favada.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/71413160140.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/gakon.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/99392505007.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609de9c530292---nurogi.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/ronarewo.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/77322599480.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/30234753310.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/7107482254.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/kosidujoku.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_off0000da44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA44 16472 bytes
SHA-256: 365bf2fbe89fd405651f735918a2a90dcf7af5edd39ce3d2c8e8144618349b3e
font_01_sfnt_off000104da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF1 10772 bytes
SHA-256: a5ca63f63948a46e3f3feb14e0cec388fb21c40ab535ba903c440374e45b03cc