Malicious PDF — malware analysis report

Static analysis result for SHA-256 3420976f885c85a8…

MALICIOUS

PDF

82.1 KB Created: 2021-09-03 11:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e8f5c6b7b9d5f1f83cd5bd799f1ffd65 SHA-1: f6f2609f5424df12c73470fac55700b4ff54a1eb SHA-256: 3420976f885c85a8bd7f7451b5d6941cd3fa311e0876019043805c0ebd2a6c1d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous URLs, many pointing to compromised CMS uploads and disposable hosting, indicates a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://livres-d-art.com/ckfinder/userfiles/files/wetijamosawifusozidu.pdf In PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a61c9e55869---xejogi.pdfIn PDF document text
    • http://vce34.ru/attachments/file/vexupifojovi.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd09ca8c45---darurifo.pdfIn PDF document text
    • http://flexicourse.cz/res/file/gopug.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7b9de9c35---59671598288.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/0hjcoj9ngf09bha1dg8ehffo31/17313355709.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/3062218358.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/83431907677.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/47231275923.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/11293986854.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/zuroxalusadiw.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/44037b73e616915d53ed6006726f7d91/mutunudejevotadel.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/63859250646.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/wopemifadutuzuru.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61407191907.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/07t25j9ud0ao31b6ruugfga891/47222918792.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/dubasexiwi.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/tijufa.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c70637b47b---24541897238.pdfIn PDF document text
    • http://www.moyekolodin.com/files/tuferatovanogunidawirala.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/74326701713.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=antropologia+pdf+resumoPDF 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_off0000d7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AB 19368 bytes
SHA-256: 46fbb182610e01655dd52b4c5a4d9d123daece6beaaa28075613127b2cec35e7
font_01_sfnt_off0001098f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098F 10924 bytes
SHA-256: ff469245d1aadbb89922e71b67eefcfa2c4c3bbae7def41a39b7e66200110f68
font_02_sfnt_off000122b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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