Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc00789d164b2cf…

MALICIOUS

PDF

83.4 KB Created: 2021-09-09 12:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9f856d977fb4de60034cac067a594fdc SHA-1: 8bf83c97b6e093924bc47aa309698f876faf023c SHA-256: acc00789d164b2cfe52bc088c92c592415ab2efa6020564d35f563393d30076d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised WordPress sites, which likely serve as part of a link farm to obscure the ultimate destination. The presence of embedded URLs and the nature of the heuristics suggest this PDF is designed to lure users to malicious sites, potentially for phishing or to download further malware. No scripts were extracted, but the PDF structure itself is used to facilitate the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://wonikqnc.com/upload/editor/file/1630937128.pdf In PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/70064b5f1fef00ffd30ef8684e2c397d/nokoge.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/dixegelanixowikaxodozewi.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/861f9fe6810dcdc228b37f4d0b5e26f4/79916354263.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/7184273339.pdfIn PDF document text
    • https://camphacement.vn/upload/files/92200384135.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ij3m38eijmtsm6vej35tiv8b70/58934190149.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613947a89c199---8795329562.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///dewadupopakebumusu.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/55323399388.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/zosonomaxadin.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/xalirudigumotenazu.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/33089954459.pdfIn PDF document text
    • http://plncse.hu/php_data/file/kijidilu.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/sesopoponiminafobojozawaf.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83024261142.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/89816480669.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/fikomojino.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/82190922885.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/67411949106.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/85985603520.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/ramaxegosejejivinowet.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/94268131251.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/kowuwa.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/9586416931.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=loop+habit+appPDF 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_off0000e36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36E 18200 bytes
SHA-256: ab87468ebb63f05370eca7f8095f02843f53c02cde092fcb6586ec115f9776af
font_01_sfnt_off000112af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AF 9896 bytes
SHA-256: b3b4107f4626b617bd25e2493c01d0da877c9bc1e3c861dcfaf7bfee4ee261ab
font_02_sfnt_off0001285a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1