Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8888eb7f2d8c64f…

MALICIOUS

PDF

82.3 KB Created: 2021-10-16 23:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3ef84a8daf33c35389f254b1f4da09f6 SHA-1: fd3835fad793c5c90d32526bd38a66448fb4b07a SHA-256: d8888eb7f2d8c64fb1bf101d1ce4a7ecb187163f1bc5f72220ee4868352ca40e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The presence of embedded URLs and the nature of the heuristics suggest it is designed to lead users to phishing content or other malicious sites, potentially leveraging JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/9ff3de8de929b3793088a23175f462cd/90834493745.pdf In PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/wejilujowolopape.pdfIn PDF document text
    • http://infosierra.es/images/editor/31252632774.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16167737c3ca4c---90143895999.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16162d0a259978---dokujebatubozo.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/24199924802.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/65343138433.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135eefb2da91---31539922394.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109301621181969.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161635477eedd4---gufofopojajolugiwulabe.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/65098662551.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/puwiranewatowobaf.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/sumewag.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/kvmpl5e67875leckts6b7jiq65/7595436052.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1632653741.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/wurov.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/lirovilipabesadok.pdfIn PDF document text
    • http://17njl.com/userfiles/files/dofewurukupexegomut.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/b8de271c170bf7b07a1dbd8b816f1677/99367042596.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/93094202516.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/29738750690.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/152ef5cfbd013d6202ee9d77c37e85ae/sipewidinov.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20211008_DE80CF9B1725EC44.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/Z3ufxtS7Wvw/uplcv?utm_term=pinched+nerve+in+lower+left+backPDF 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_off0000df82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF82 10788 bytes
SHA-256: edeb391b8784639e92bc8bcc5835f42391fe0635b14284a33be16212c2cf46d8
font_01_sfnt_off0000f84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84C 16508 bytes
SHA-256: 36b22142f02d0288400055fb74905c05b1aa7817690684909943b203f1e0e899
font_02_sfnt_off0001230f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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