Malicious PDF — malware analysis report

Static analysis result for SHA-256 b019a256c1fe46f0…

MALICIOUS

PDF

87.9 KB Created: 2021-09-01 17:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f43fe610d6586d5cb655d5f26f4e8764 SHA-1: c9a27c4308dcb660a819d4385aceeccb2c9683f7 SHA-256: b019a256c1fe46f0c28b13eeb61909ceddb9f7d1bd73453a0bad0aaf6919591e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and presents a link farm pointing to compromised WordPress upload storage, suggesting it's used to redirect users to malicious sites or download further payloads. The primary attack pattern involves exploiting user trust through a document that leads to compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9a6a4f04b---29652304362.pdf In PDF document text
    • https://e-uchebnici.com/img/file/korebopekuvatudepaj.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/darutizisonuxuzamuxe.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210803_C94B23A0A8CDB6C3.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/529398b581bd544caafb4cc46ea4f489/37651313256.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/26d3b4e5c097ac9a02d777237802556b/zakejoxemolusi.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/sanenexododevafefenaru.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/1480688358.pdfIn PDF document text
    • http://dgjst.com/upfile/file/32691574700.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/7ch53dlggscp9h6p8ei6m3fb53/49350767230.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19524623960.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/renepusukexunofan.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/telimuvakusov.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e941394ad---pepofos.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5daeaa4a50---1677435388.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/xipomo.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/36137588203.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/kaxoziwujigosuropada.pdfIn PDF document text
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/5494731395.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021082700564573499.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/rtra9mhrucbsa8lfti22s8ilvu/27091859230.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/e5a333984a1f12d5361edeeb39c1ba68/zuvuvuxabule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=global+sustainable+developmentPDF 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_off0000f215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF215 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A27 18076 bytes
SHA-256: b738e33b3c7aee2e1a3d0de6c6a863947074a48ba5ce96d65f0074e51ebd469b
font_02_sfnt_off00013964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13964 10796 bytes
SHA-256: ae7fab2de490731272ec22debb62f17bde451f46e439b6dbad49e77a974fff3e

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