Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d7f86a1535ae8f…

MALICIOUS

PDF

81.9 KB Created: 2021-09-02 05:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 8c55b7aad4b549d1c7bf5508901e3d68 SHA-1: 046754dc043592e8070c8be77c3002bc03161bc2 SHA-256: 78d7f86a1535ae8f3bed18b69e5b894fb517e8fb4f9badea755053d326276fcf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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 http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4ad3df539---31605911513.pdf In PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/golebavo.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb896dd6e6---xefiwizelafa.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/getowofuzulufud.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/tetugajitamuvope.pdfIn PDF document text
    • https://carlojans.com/cms/file/40626409233.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0ce887037---2823495758.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/mudepuxa.pdfIn PDF document text
    • http://shsclassof1970.org/clients/872719/File/90211788938.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109027172de4---92744410150.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803f45d3816---lofosox.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/wobazepuxurebowaw.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/92279883189.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ad49cbddd3f526c757d7e324f2ee64e/biguvefafekadabimidodeb.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/zolejelomitawosefipigo.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608454dce00df---60011433007.pdfIn PDF document text
    • https://arerp.kr/data/file///98101935132.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/86168567405.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bef498ba6---91218234188.pdfIn PDF document text
    • http://partnercable.hu/files/genozi.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/vudexomakojobekosilo.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/81171d22d2c7894de489eef3bb776f32/wogagixuv.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/temadukajarifiwexuf.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/zisobodixinegixugozo.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/55912330547.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=leadership+that+gets+results+summaryPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B1 16444 bytes
SHA-256: 9dfeadb8093bacf239be1144bcb92b346100c9e3acd34300073d374a7350f5ee
font_01_sfnt_off0000edde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDE 10784 bytes
SHA-256: dc77d678aad2803a4b2a3bf85277a7d7c0ed8799930a0ab6ad66ff79295b9006
font_02_sfnt_off00010677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10677 17588 bytes
SHA-256: 146c329376dff742b7d1547c25dab9e9d6308c990591b516928d6521dc975547
font_03_sfnt_off00012181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12181 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1