Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a043de52d3236fd…

MALICIOUS

PDF

85.5 KB Created: 2021-07-06 02:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c58abef147f7709c2fd72c4f185c511d SHA-1: 913ddb7c42e076eee99d0cb4003d4c1d62bac446 SHA-256: 6a043de52d3236fd4e744ca58d8b3e7a410cf82ec2a6e4cb15c4a70a6f1966d2
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. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to obscure malicious destinations. The embedded JavaScript likely facilitates the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/66a36705bbff9760729d92f243f64ae1/gosowadefovi.pdf In PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3e663e5d2---15315316424.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/28466087810.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/rozopiwedoniw.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf5072773d---mitaj.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077f863b1c6e---bolus.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/kosavixiziwodom.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/50186370867.pdfIn PDF document text
    • http://sns.hu/_user/file/32489557310.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/805b6c8962603c2ea6ae52b84d73d2a2/5549678178.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da7b27a7ef---18688591067.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/88041631044.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/8813933432.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/webuvexikadatabeditura.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/mivowuri.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/77639452255.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/11d3ded4c87aaecc0bca9406c46ddc73/18743789048.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983cf1e0cb3---tukozitikojejulisukojudo.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/9ff07d42fe0d69808fea908ea144ef42/tukiga.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/bf793366ca107a844d14a8bf71b78bbf/47668819409.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/83785192583.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/vmti3c8cqed73ueaorhlrmih4i/77832131792.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/e782de6dd1e5de26ba89b02c2a619854/26699137077.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/wifejizafimunifobexis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+draw+a+sealPDF 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_off0000eea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B9 16812 bytes
SHA-256: cc74df380e7fd83b587b16a63ba27d78ab194a552dbf4f702e87a30d33adaf5b
font_02_sfnt_off0001327d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327D 10124 bytes
SHA-256: 3c4d5e38502552e5cd4bddc5b92e3d37c9b50a00c860bba56719966a469ed0e4

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