Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c75cc38e012ecae…

MALICIOUS

PDF

76.1 KB Created: 2021-10-06 12:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fc30fb1fcedf3f16cad07c333bb6868a SHA-1: 1c76a0e0bdad05bcdbbe6cbeb993b89771ce8962 SHA-256: 3c75cc38e012ecae0a91aa797fed0751625a36b3ddcf609f3b3e9f3ab2af4426
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It functions as a link farm, with many URLs pointing to websites hosted on compromised CMS platforms, including WordPress. The presence of embedded URLs and the nature of the heuristics suggest an attempt to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=restriction+mapping+worksheet+answers PDF link annotation
    • http://alacarte-design.de/userfiles/file/wikanegariletatebipagebon.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148432d217db---zaxebofebi.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///202109095560_120664925.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/16326078294.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/22a020a31dbc3edf2cb4c90d94e679ae/ronot.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/11572254576.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/tusuvi.pdfIn PDF document text
    • http://jn-zhsc.com/upload/5248164018.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/kuzoletetetoki.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/4516335762.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/begagido.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/wixibuzaropexogovipom.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/11370041796.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/19254968960.pdfIn PDF document text
    • http://lovesenergy.com/file/vigidive.pdfIn PDF document text
    • http://elektron.be/public/userimgs/files/41923773180.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb248fb32---susovawuxajexupev.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/17417001415.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20211002210411.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/wajemi.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614116066c1ea---maxarajudusefugukotatus.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210923082214.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615ca3895bf88---sugitadifevitig.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/bilumodiverez.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_off0000bfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DA 11000 bytes
SHA-256: 0ecc798ae7601e5c775b58ad8c3ea2b4dc46b7d449be563c443e68cd9bddc7af
font_02_sfnt_off0000f151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF151 18012 bytes
SHA-256: 037b97d2d3959eeba58d5e38d89899984d68ea6e797df75e42c0aff0ff1b5fc5

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