Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc8a5c757a48c5a…

MALICIOUS

PDF

79.3 KB Created: 2021-09-01 10:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fba2be89d4eccbfb869df6fbf870ea3e SHA-1: c8108da0610b42a897caf680d76be35a94f90713 SHA-256: 5bc8a5c757a48c5a92d53dc3973f02e0940b3bdfaa6726c7f3ba2b9d559990e3
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm or distribution point. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL analysis suggest the file's primary purpose is to redirect users to potentially malicious sites or to host further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 5

  • 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://denizlihorozu.com/resimler/files/72912372371.pdf In PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/fojemav.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/zukefigovolidozikul.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/27222685529.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cdec7a63c---mapilokugew.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/7e8d556aa8c5251dd491b09e1fcb25a5/jatukidiguzamibimaf.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8f86a4850c---votapezapu.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/kokotilize.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/j7vd76e0nbdr67v3kmd74kob51/tutifumerenanimonituwof.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/rawalux.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/fogebafixezivofuvof.pdfIn PDF document text
    • http://heyibnb.com/CKEdit/upload/files/fasexipozidarumuron.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/21776940747.pdfIn PDF document text
    • http://markone-tools.com/upload/files/bemokagom.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210805232236_gsut90.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fc5212ac5---42743537581.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/1c50839d9828400a2051a69d6b3a596c/pifezirorolilefazu.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1609fde0234713---90145021108.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086938d18b56---bixabinuxo.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba94acf345e---59352480834.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/46138722350.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/7aef9650d13721be5f2e39f26410f41a/wuwexidunovitulajage.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/sorofiwujefetenetaxej.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/titatebejakifuganototafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=modern+day+canterbury+talesPDF 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_off0000d14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14B 17156 bytes
SHA-256: 46b4c344307ac91053993e672e167bb3b38cda0173919ce10a0d4894fcc8f7c2
font_01_sfnt_off0000fded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11604 10620 bytes
SHA-256: 75e1ce2c4dec40c9c0d8270176030b6ea52c5e49d63981c555d7421177b0c311

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