Malicious PDF — malware analysis report

Static analysis result for SHA-256 386d1ea6e91488f3…

MALICIOUS

PDF

85.5 KB Created: 2021-07-08 10:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9fc7f984b60852a8c6713d5ac5b5824f SHA-1: 9cc3aa4a04c0163d5b60fdfd9fb2dcd6de5d2844 SHA-256: 386d1ea6e91488f3a3e1446b430f93e1fdbd56f5c871030f63de361509b7e706
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final malicious destination. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://medi-sen.com/files/files/12575764048.pdf In PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/dac52c7c4d16762bc730c88c7f94629c/nebifefoga.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/62344183569.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/98162668456.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/tajumitoke.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/80851266975.pdfIn PDF document text
    • http://altinay-law.com/images/file/28040498861.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/35257680527.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/welofofidilonewize.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/guzatosomewu.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e4f02dad4---62560064037.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/be4971df729a148c619a1f50580cc9f7/74188977198.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/6285119cb7c09d670bcaef50c33a78b2/xukunowubafikilarulaw.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608407f30787d---66282473236.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/55286807530.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/18437196962.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/55691368233.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4a704e9f9---9934811554.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/40031479083.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/ovkj3c6661ocvcid8icl0sau9t/62014432482.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/kowiz.pdfIn PDF document text
    • http://simonide.org/userfiles/file/gojojuxodolufuwokof.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/486cc4de3a392bcf59a1cf7f6bca30de/81018109752.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/rojozoluxazumudof.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/39d6fa7eec38fd29e765743b8ac27863/72039834345.pdfIn PDF document text
    • https://leler.com/wm/bio.htmlMyIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=airplay+display+off+onlyPDF 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_off0000d140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD140 10356 bytes
SHA-256: 996d7c175d499b2bd4a1932fc0ac676473b1abe7b3cfccd50a067f5003c9d3cc
font_01_sfnt_off0000e8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A9 17416 bytes
SHA-256: b7d8d661a845c398ce94d5bff5d4ebfaf503a2d52408aad9ff588ff7aa1624ed
font_02_sfnt_off000102d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D6 16852 bytes
SHA-256: 10b212dd63a96cd4825f3781bc96fe09beab004e693914c83e35e6bdaef005f1
font_03_sfnt_off00012e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1