Malicious PDF — malware analysis report

Static analysis result for SHA-256 542b685c0ee6fcc5…

MALICIOUS

PDF

68.2 KB Created: 2021-09-26 21:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d7c67388cbf583d720615d4c1dd834c9 SHA-1: ce3af4bb6099efc547422601239b6d86b55facfe SHA-256: 542b685c0ee6fcc5344a97b42de617e9f3857bf54b7bd51a444a642fd3b47d80
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest an intent to distribute malicious content or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://abwmountvernon.com/uploads/files/nivewapapedaliwozubarowa.pdf In PDF document text
    • http://www.physedu.in/newsite/userfiles/files/torafexofogigafonutev.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/56156554660.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/zebidaxavukokevonilel.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/79840468331.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/sifefopavegemineru.pdfIn PDF document text
    • http://web5gstore.com/Files/files/jafoxok.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/73067014476.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/9ddbdca91247c177e26bc83c8214a71a/41241216962.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/82801920384.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/79546406169.pdfIn PDF document text
    • http://halanmilk.com/upload/files/dobefutaporozoxijudabaf.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443bdb8f7f6---98174881567.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/64059492047.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e2834f0f71---puguziliwelogufiwitun.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/xapaluretovabebajirowimep.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/ranewelunowutovodumepa.pdfIn PDF document text
    • https://akemi.ro/hirek/file/nanukudivip.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210916055039.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/suziforixevebofukowam.pdfIn PDF document text
    • http://benrassam.com/uploads/files/67779236693.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/85050889113.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/59012839262.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/7u94j6f0flf40uf73i8ibvthsk/fevexadoroner.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/refif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=happymod+app+iosPDF 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_off0000b0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BC 14532 bytes
SHA-256: a8e380dae45b0ac658920080731b6e31d6385269d92f9e29d38c0984fc07d7be
font_02_sfnt_off0000ed2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2E 10176 bytes
SHA-256: 98fffcf0e77a8753464fe18e0749e495dd068b83025f03fb8998381266b49621