Malicious PDF — malware analysis report

Static analysis result for SHA-256 da73ed11fefcd50b…

MALICIOUS

PDF

69.9 KB Created: 2021-10-03 04:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: dabfed5d9cb560b36e7f65b56b014dbc SHA-1: 3eeb421e0caf57ab3aaba31eb8f434f699d0c267 SHA-256: da73ed11fefcd50b545a1a46c0c9f30a0e68c9fbbc5e138b3e1de39b817ffd7c
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress upload directories or other potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The presence of embedded JavaScript suggests it may be used to execute further malicious actions or facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://mygenius.ru/admin/ckfinder/userfiles/files/tifafabaguvofofon.pdf In PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613273461d86d---28232790911.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/31851778422.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/68495814836.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/gusumipofabisosutabidi.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161458c9b74174---64771272962.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/89190575968.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/kimopiwulalilosumisedezo.pdfIn PDF document text
    • https://novsport.com/content/File/10110849323.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fddca075da---nifixufakatelex.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/11172765289.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/texojewaripesuwusozugite.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614a00e479c9e---tadam.pdfIn PDF document text
    • http://tercovci.cz/files/file/44535204750.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-12/20210912095650122597.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/5d76d3ad9f028a5aa14b4ca931827efb/rigenowamevutib.pdfIn PDF document text
    • http://dogoxuavanay.vn/uploads/files/37343936202.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/rigizazosapupari.pdfIn PDF document text
    • https://ms1oke.com/contents/files/takinozi.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/21538727682.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/24430517264.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/33177150347.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+fast+is+the+speed+of+soundPDF 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_off0000afa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA7 16684 bytes
SHA-256: aaf5059d34b178fbe952c67d77b3cacf59cb37c25c51e7c7baa440aab693bd5c
font_01_sfnt_off0000da2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF246 10628 bytes
SHA-256: 29608584e31b59be9732c21363b7420a2cf1726016d38ecf378b19d0bb03a8b7