Malicious PDF — malware analysis report

Static analysis result for SHA-256 b06d47b14ee9a8a8…

MALICIOUS

PDF

82.3 KB Created: 2021-08-27 16:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a7a886d7cc66b6f6d5ee9499a9bc969c SHA-1: 761de3f75c9804b36d5187be51957acd6c3f8f19 SHA-256: b06d47b14ee9a8a80e9e82002e8bedc08a7bb92ebf0a7d8629903d6b177faba0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nomylo.ru/uplcv?utm_term=world+music+a+very+short+introduction+pdf PDF link annotation
    • http://wskinbody.com/data/boardData/files/60797565096.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/sotaxutegefenevosuku.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/8198a12056b687f2fca36198347707b5/xaletupawotazarilelo.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1611efab406379---rogabudumopidi.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72129811677.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/75660671426.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/57296405992.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021072808594573499.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/2ffa1e865297b258f33f7d8934b2f78e/82141308146.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/844de69e640be6456d75c69392df98e5/95253626956.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/13556699141.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/18011487787.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/65448288808.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/74423610793.pdfIn PDF document text
    • https://dhcom.vn/userfiles/file/xiwubijobapisisorimut.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/c897f5e53ac4cd68c99504f92db988c6/mabibifitoris.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/99269231072.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/1663670814.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/likoroxu.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/xasagojosu.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/196d931472ade36eaa88195cc72bf1cf/8107052022.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/88698602677.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_off0000dd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD61 11156 bytes
SHA-256: d128d97140be8d43134e2d33575138801b9955f29f4b0f60e55633b088098536
font_01_sfnt_off0000f74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74F 16980 bytes
SHA-256: a30800cdfc6160fdacbd910b341cf29305187362c796c7d1c07142e7b602868e
font_02_sfnt_off0001233b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1