Malicious PDF — malware analysis report

Static analysis result for SHA-256 335562c46b932821…

MALICIOUS

PDF

84.7 KB Created: 2021-09-06 09:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 95fdd53be8fcaf66c0165fb88885388c SHA-1: 06c92fbf2b57c3c1f49e2b8bf71d9887cc2d656d SHA-256: 335562c46b932821a3a62523e2d1226b7828d14058999ce783838d19652db5f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites and other disposable hosting. These links likely serve as a link farm to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609861235697e---givajoxubumoteb.pdf In PDF document text
    • http://www.77ice.com/upload/files/72020910571.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/rezulaxosedujimevo.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/36868817502.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/xelajugozufos.pdfIn PDF document text
    • http://hainfelderteich.at/18386554477.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/74493660546.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/37683144848.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3229d12a74---wopavinadadasi.pdfIn PDF document text
    • http://soupworld.de/upload/file/sujojigis.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/54913408281.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/19238842687.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7sgo2em7dcvvgr71074vvbobe0/22568186979.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/32097799526.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/nolemunefijazowuralupo.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16071bc3611b19---4588880484.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/651386990.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/firiminegomoranitod.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7355b7c8f---tosefiz.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/lujojixuvuvenivevek.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb91c85a2e---84433172485.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/26581893515.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/45581123953.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/9ab293dcd89c4930c741a92aa4ff8a4a/fiviwilogabonipigaziso.pdfIn PDF document text
    • https://agermag.ro/mm/file/karejixelavebokuv.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/77145031680.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=importancia+de+la+lectura+y+escritura+en+los+ni%C3%B1os+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_off0000e0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EA 18508 bytes
SHA-256: 474b30133a52e6b07ca2b27a7e43dd4207b6793f4ef4579129334da09bdff293
font_02_sfnt_off000127b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B8 11152 bytes
SHA-256: 81c624533d2bb3b1481ff24ff31f62c5c8a7d9c0d1e7a30d971b6e9bfb72a53e