Malicious PDF — malware analysis report

Static analysis result for SHA-256 86bcdcae8a021890…

MALICIOUS

PDF

81.4 KB Created: 2021-09-02 03:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a6e31e282a341d6abb17271d3337799d SHA-1: d714ca52ee7fb958c014862661924ae947306676 SHA-256: 86bcdcae8a021890c4cb2b9f855261b8a4b4f9e10f11c86687830e26fe466a5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=normal+vital+signs+for+2+year+old PDF link annotation
    • https://gplacestracker.com/userfiles/file/68061811321.pdfIn PDF document text
    • https://aspirans.com/files/file/nedaxofubevew.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c01cda01a---zavemisofuposun.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/dadoma.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/1cd2997dbf7ec362988c736228d2aa04/53079822016.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/32768606375.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/30674651633.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/7787299143.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddbff97cd0---sidomuvesox.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/ranasunasajupatetoxe.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/61644800615.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/46348679048.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/77022943356.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/50409998915.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/nujagipugepiragirebuga.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/cc2180c71c36a2ff514c57014e04b06c/kabenenetewuvuletiw.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/29640938766.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/41331123692.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fadca2ede5bae82fe90733074f35c287/60539241617.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/1755599175.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a89a7b79949---7991994915.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_off0000d8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D9 10972 bytes
SHA-256: 0bafb22c40f424f4bc0087186f471d94363687a8d832cbe2e8f67ebf816ba135
font_01_sfnt_off0000f22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22E 17364 bytes
SHA-256: 2ed341fcb8ab86d0c8e61b928327a32e5bf96012b817a759ad7dfef2748c8583
font_02_sfnt_off00011edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1