Malicious PDF — malware analysis report

Static analysis result for SHA-256 1518b48ac3b6b72d…

MALICIOUS

PDF

87.1 KB Created: 2021-07-15 19:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ef04050bc3e437e970065973854ce898 SHA-1: 94aa5993045097b22a6281c1e9a307d8cd18c72f SHA-256: 1518b48ac3b6b72d45b9cd24cd11dba1f5a65215369257abc97f3056f9bf60c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://krisoc.ru/uplcv?utm_term=how+to+make+java+run+faster PDF link annotation
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607173fc65a93---70929690791.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/mozujudozakixejijik.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/6502fe7fbdc624f47681e83b8ae54e72/86551480881.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/43908044996.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/95936202322.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072cba28ceff---xazazonilox.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/8d4hsilj6la5qg88lm381kdgvi/wuxodobakidaruwadonavug.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16077aa29b95a5---85915851554.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/jobawomuxafetitizuvatugak.pdfIn PDF document text
    • http://sakem.org/userfiles/files/fakome.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/0194003de054ae309753253d6747b3c1/lamexopawadugixokus.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-2/20210502051642181707.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da1eb25df22---titap.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/7421299742.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/8b5e56cd3291415318849d1cdb9e4f18/69842081331.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/fukiwesexugerepidibino.pdfIn PDF document text
    • https://noblacklist.pro/web/img/podborky/files/bawamamadepavunifopalo.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/1jl3jtqdcc51774cv92elu4m98/xoweguwakemorewos.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/11666443611.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/lapozekukekiviwa.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/fojojizatoni.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/gtb70jeg6me2rtnoct9ijujv80/38424916112.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/5bb58787a3ea8b606f189b87031760ad/55509973412.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_off0000f025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF025 17880 bytes
SHA-256: f138d4a537feaefee29aa84083384f3970bb8362f5fcebfedae4d32c47eefc80
font_01_sfnt_off00011e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E89 10700 bytes
SHA-256: 61298ccf2ef1ce5ac3f04e68853dc58451936da09e686d0c0e38d63d83dd65d0
font_02_sfnt_off00013728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13728 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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