Malicious PDF — malware analysis report

Static analysis result for SHA-256 f09699f4007546e0…

MALICIOUS

PDF

90.9 KB Created: 2021-07-03 03:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 76fe45981f153b108de68133d714e4b2 SHA-1: b6f9943d123116f8c59506f92c6c3ee22c9be04d SHA-256: f09699f4007546e0e6267b4dac0e61f40de498d83b1886d9d2297a4556cf2f8c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to link farms hosted on compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a secondary payload via the provided links. The presence of JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mywayrtk.info/userfiles/file/19252882356.pdf In PDF document text
    • http://agcslohian.com/userfiles/file/xakegatifujalago.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/g2bull5i2bfvn3cbgan5ksmifm/5621118186.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/67588824975.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2998d54ea2---82942392894.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/0301ffb30e701801118bcb1703e359cf/fuwofaxepokumur.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/xitopogebabud.pdfIn PDF document text
    • http://limoride.net/gallery/file/sizoranimokagewizuwufe.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/5be798754e62ed30c804f1a057b67818/sudomuzilawuduvuzuwugosaf.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/jiuqvqq6el5gmcbpasbhlnb50i/46150542753.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/neset.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c866b164bf6---masaben.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/6d1oigi94lvper5od9dn64tbot/gozevitexox.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607070a22b96c---lerifemi.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946c1d004d5---zoxiriramapigorami.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/19202446772.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/qor2krb824rgof3r9b3bgl1vl3/19361478513.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/4t1v48k2985ge1e1vgdqj7frqd/23009822548.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/womirod.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/44a25dvf3g7ogmnh9nacb9eecs/73436511062.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16086f23fb83ab---80500514874.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869f8e8a6e8.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=chincoteague+island+attractionsPDF 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_off0000ff2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2E 10780 bytes
SHA-256: edcfc890a4c9eaef6944cee30cc47813367f95dca47b4e052c9926c93ed8b841
font_01_sfnt_off000117c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C0 17716 bytes
SHA-256: 761c90828aa5696c28adcf486adde8cfd29bc63863f15bb8e669b242ceb30050
font_02_sfnt_off0001467a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1467A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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