Malicious PDF — malware analysis report

Static analysis result for SHA-256 be4afa0433beba8b…

MALICIOUS

PDF

73.4 KB Created: 2021-09-22 20:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aaa0aa469501afb9e0c921cfd67aca4e SHA-1: 3d0ff7b0c8df53f94ab468977eb917646fd904e1 SHA-256: be4afa0433beba8bd966d8eb05754dbe04cb4b085537240b112996479bb77e60
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://npi-management.com/ressource/site-image/files/forefo.pdf In PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/52201357564.pdfIn PDF document text
    • http://tfforming.ru/d/files/liviximovifef.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/nolupafa.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/91580519675.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/20cd2de6080aa9a16d5e8deeef33e870/36638122194.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-20/images/files/bibilezexuwer.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/jejuzejomuvubasenime.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/16e4a41fbfe5e82b1b50ed025d7dadc8/lazexipogejoto.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161397d9e37aa3---74540884163.pdfIn PDF document text
    • https://netlandschool.cl/files/juvopuvepezotavuxogosemaf.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/makelumakulujiwulotanoza.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/19290126216.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/78343399119.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/jozevuravima.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16144df1a137b1---39896783548.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/vafanofajufo.pdfIn PDF document text
    • https://deloge-nt.fr/media/photo/file/nemipudubopepul.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/53653949750.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/fudewokeg.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/xowibesokuvog.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/koxisen.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/dubozesureli.pdfIn PDF document text
    • http://canoeing.by/pics/files/tifot.pdfIn PDF document text
    • http://syekp.gr/sites/default/files/file/53293061383.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=boruto+next+gen+gogoanimePDF 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_off0000bed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED9 16076 bytes
SHA-256: be6191b364c12f435a2842db1e24238d6ae2046c409c985f8bccc22e1c891ed3
font_01_sfnt_off0000e823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE823 10492 bytes
SHA-256: 9be1cf359f41028d90a06cf693e0d2d8341886472d48f24441a85fe522e1fd17
font_02_sfnt_off0001000d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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