Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9a2fa689fcbff4…

MALICIOUS

PDF

65.1 KB Created: 2021-09-25 06:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3221dac4ecc08a54e5fe3f6f2d02df1e SHA-1: 9f3ed9333624710ef380743e55f677ac838ae7d6 SHA-256: 1b9a2fa689fcbff4cb06fea18888313f88bd5b238c2ba02272d8e3dc1bec4942
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised WordPress uploads and other disposable hosting. The presence of numerous links suggests an attempt to direct users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6188

Heuristics 5

  • 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
  • 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://trungtamgiasuhcmmq.com/uplaod/quangtri/files/rotilexeniv.pdf In PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/69987159353.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/jijepeteg.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/71834121576.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/86043543784.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/tokademixokejabixupokiw.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/15750990435.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/bevuwedimereketadifiwi.pdfIn PDF document text
    • http://jawarakreasi.com/file/75752786885.pdfIn PDF document text
    • http://horvathortho.hu/tmp/vowewojetajaluniminan.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/bakekubipefamusuxapezusa.pdfIn PDF document text
    • https://viceda.com/userfiles/file/41557699246.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/debobar.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1613524501a437---53266194252.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/69373982771.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/regigitojakepit.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16134a5d0da7db---jikikulikulil.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/siguziwajumanidewew.pdfIn PDF document text
    • https://dasyueshan.org/userfiles/file/bagobezexoxetozad.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613900779ac42---laronetizenitusuverogi.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/63999904778.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/75695556544.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/77421274767.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/wuropepedovifejat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=candy+crush+soda+saga+unlimited+boostersPDF link annotation
    • 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_off0000afc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D2 15812 bytes
SHA-256: 47bebe3a1e79de0254758569317aee35f4bfe10991a7b65998d1c55583769c23
font_02_sfnt_off0000efeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEB 11204 bytes
SHA-256: d821761f17686dc51a27a63cf243c8b35f6dbda1af78391189b279dd76fc51fa

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