Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f1871a2592c959…

MALICIOUS

PDF

79.9 KB Created: 2021-09-21 06:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cff6146e75ff3ca3caf823345d85d8f3 SHA-1: 1a41faeaf67c7bdcf213618a4e01ca500189f26f SHA-256: e6f1871a2592c959d48d1e6d5096ac2d1165261a8f5f01a84703f30083f605da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://foundationkuzmanov.com/files/segomobupaxa.pdf In PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/lupubudiwov.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/4842497637.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142fc254f686---33028545724.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/51113027346.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/161457152944a1---vakakotunipi.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/9cc122932b9deb4e4e41e040fc2ca49e/suzijikepu.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210921105356.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1a568f3b9---35768149027.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210909095056.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/junolepobodad.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/4596055.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/70741261699.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/zakoxulirewotefokuza.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/72696186092.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/27806459262.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/57518402770.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613069f526672---76068290769.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/latawofugubimijobox.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/lulejubud.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/7d2l1ig478qth999o8ef97ejme/87800553459.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+clean+up+space+on+your+phonePDF 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_off0000d524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD524 17136 bytes
SHA-256: c593a07709ed7f33c790f4dbbe540551d8098cac893586f6846c2b4050022711
font_01_sfnt_off000101a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A0 10668 bytes
SHA-256: 1b6dbcbc73b6af54df8d7f0c259e67e899059d5d87b0e3d50d9dbffa2527f825
font_02_sfnt_off00011a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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