Malicious PDF — malware analysis report

Static analysis result for SHA-256 230eb285bc0b92d4…

MALICIOUS

PDF

89.4 KB Created: 2021-08-14 19:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0963d876b83c9124835f70602bf3f94b SHA-1: 26e0766d73a301e29677d84c67628bf27e643c25 SHA-256: 230eb285bc0b92d404be9849af0de190df8233d650debd9bf0cd43859b15a19e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://archism.ru/uplcv?utm_term=how+to+recover+from+an+emotionally+abusive+childhood PDF link annotation
    • https://tckontrola.hr/files/gevadomavubijegubedixi.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b85a0b7d97e---kidikaketukogefabi.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079733e90aee---binow.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/35096257386.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16117a172d9dcb---xidugezib.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/27763442576.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a974b497aa0---fexivesekisun.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/84354298439.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/34e668547c664482e66c511a11927567/68662873699.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/debojepal.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/17808197143.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/a2b1a186daf9081648e8a715591b5533/bevefawoze.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/patamajujugelutisu.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/tqh6j7l0sviqqo8vmblonmg2h4/kikosojalanumijosased.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a700c3eda43---nevavulodumugafedasokukux.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606caeea700f5---xigaxexelukurot.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e27bae57f---pufafugapititefisurejam.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/sejatenulezazufabifezax.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/filedurevovekesuruval.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077479a404af---bajupisefelitonujon.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16095b0bf6eefe---46249205610.pdfIn PDF document text
    • http://boldogelet.hu/media/tikesurubajunabifov.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/lixij.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_off0000f8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CF 17020 bytes
SHA-256: 6a334c8bf07bdc49167d48f457eec3ba5fe693d566cb32c67ad4fd0f5dec7162
font_01_sfnt_off0001250d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250D 11240 bytes
SHA-256: ce971d9b08b2a64f51302fc3a0205d562482adcf1901feae5b80d8e1ec54f0a2
font_02_sfnt_off00013f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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