Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d8ade5379efb611…

MALICIOUS

PDF

70.4 KB Created: 2021-09-14 15:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 64e101a07154b33e3b55d857d4103a76 SHA-1: 6f8c3b9da8fff2c7db493627bb7e6036b7ac6aad SHA-256: 1d8ade5379efb6115a560184780eb7c40825372633c06b980fce4e75288f8ef7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting the user to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://queure.ru/uplcv?utm_term=juegos+rpg+android+gratis PDF link annotation
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/63943f3672eddba6f3402f1bbf0ab8fb/fekolilubikexumogotutof.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/budepelirisizoxujeparoxi.pdfIn PDF document text
    • http://tourgrodno.by/images/content/file/lonebedevapom.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/60348346017.pdfIn PDF document text
    • http://airzo.net/userData/board/file/bujajagiguxesasen.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320075121c4---kelulitipado.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/dijukirarexebixam.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109120259089511.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/18498035385.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/63743266730.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/zajeb.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6e4f37a90---40813623768.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/mogofurofilenifute.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/77262604064.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/gomejubikemosasotu.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/bifisano.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c34ca9b5bc---kosolodewapevodopowile.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/xowimu.pdfIn PDF document text
    • http://babamoleskine.com/files/file/dikigesebox.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84337259072.pdfIn PDF document text
    • https://castel.ro/userfiles/file/mesumilu.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/vipolopomasi.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/lubejesedu.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/potetosorilirabejef.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_off0000b39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39B 15568 bytes
SHA-256: b5dc9345d05312beaab14ba3431fae1fec033529e5d6a65c9152868691ba33eb
font_01_sfnt_off0000daab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAB 10612 bytes
SHA-256: 91b7790294b0d657ced23ae87620cbccdf52e85ca6b354335610564152145eae
font_02_sfnt_off0000f2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.