Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f5b32d864ae89a…

MALICIOUS

PDF

84.9 KB Created: 2021-09-06 22:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: befc492a735916d03cbff4d3522bc547 SHA-1: 56b8de4b74e0e45fc5b0907e014e9e6de3665829 SHA-256: d4f5b32d864ae89a467051bb9193cf56075077c162fbb7e9c2612578da284dc1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The file's structure and the nature of the embedded links suggest an attempt to lure users to malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://csc-020.com/userfiles/file/20210707034854_9j5r0r.pdf In PDF document text
    • http://malagi.pl/user-files/fck/file/61882612897.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/dosaxevumexitepabe.pdfIn PDF document text
    • http://checopharma.com/upload/files/wakibeji.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbcefd92d4---votenadobimof.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ut53jfb93piu9gqj6aaajlgmpg/30181620270.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/vuguxamux.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1bcece2f5---79049138684.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/17405284375.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/88105358643.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/bijawopaxapojodexiv.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16124e6fe05777---ponakoj.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/9400142ac70e4930dc6405f8e411b218/tapewabususedapewito.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb1c88045f---vimovutozus.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/e71b6a75eaa1270f37a9db47fcd23507/zikilut.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/morejanipovobi.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/57783300425.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/35659473092.pdfIn PDF document text
    • http://hanleyresources.com/images/52912348707.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/10672518483.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/fuwubejilolekulukew.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/fb5c843c00a3497bb25aefda2390fed7/rifole.pdfIn PDF document text
    • http://stolocatering.ca/clients/874514/File/19936139329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=honda+vtr+1000+manual+cam+chain+tensionersPDF 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_off0000e637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE637 17768 bytes
SHA-256: 5d32db702a8fcd8fa432fae203fb3019e544aa54768ecc60518ecb44f35c713a
font_01_sfnt_off000114a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A3 10968 bytes
SHA-256: fc4fa8a82acf4ca2a095475a88ea33c5fec154133968d843feee588e36335568
font_02_sfnt_off00012de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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