Malicious PDF — malware analysis report

Static analysis result for SHA-256 23e92144a9bae259…

MALICIOUS

PDF

77.2 KB Created: 2021-09-01 09:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8531a6046814d48b089d6fbcac048ed4 SHA-1: 96667e17871d5fa89ac6ccc9b2b2d3a9c641dd8c SHA-256: 23e92144a9bae2599f29b015245c9d358b14b586d6124c244ef98391ac2fca9e
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content. ClamAV and ML classifiers identify this file as a phishing trojan, indicating a high likelihood of malicious intent. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://carlojans.com/cms/file/11627568093.pdf In PDF document text
    • http://lianbang123.com/uploads/files/202108172356593163.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d62ff21a6d---mumaguwilawijapa.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b33e4174d5a---20762795612.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/xopijefilazopef.pdfIn PDF document text
    • https://0900107678.com/upload/file/79051994465.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/musolifupila.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/fc2419998fbb7ebfbaa7095c40418ce4/vefosizi.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/churqpjph0npm44ngk3k4mqdar/juliwenakedomasej.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7ae070fdadc79fe322392022474be21b/63929837843.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210613_BEED8A2EA43F803A.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/48100695964.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae3dcd6d46---78511190402.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cdcd075d1e5---35195109006.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/ef8e01d5c6088c0921d0ba31ad4de513/viteloburatajigub.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/xojeme.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b55ce97723---35841565643.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/50855520590.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/e22c8db5f73f28e75a92866a994a9fea/xekaguwomejirit.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/piduxipereg.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/15377483853.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/52809937701.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/96285132079.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/vudibitanufofawuvoz.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16102e9f67954c---taxunabakusilikokaw.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160943d64967d9---menenoxelaxir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=power+electronics+based+projects+pdfPDF link annotation
    • 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_off0000c944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC944 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE156 16896 bytes
SHA-256: f47ec586c64374d95d70ac02cbaed765057768f78bdf226ec6049bdb3cc80b4c
font_02_sfnt_off00010ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA8 10968 bytes
SHA-256: 0878543071b689bf0c20ea751a492db97eb539e3c74e52e216eeeea9f825136f

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