Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7dbb0b25bcf864e…

MALICIOUS

PDF

76.2 KB Created: 2021-09-06 21:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4d2d030e3547763da7681a02cea675f8 SHA-1: f95c723ec2b8f7874c23d8efa7e3ec64a8527a6c SHA-256: f7dbb0b25bcf864ea986f65b1a5bfa5246009ae239b6e706b17293537ea6b626
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and numerous external links, many of which point to compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript and link farm suggest an attempt to exploit vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7603

Heuristics 6

  • 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.
  • 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
  • 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://allytemp.ru/uplcv?utm_term=mad+libs+funny+pdf PDF link annotation
    • http://automsystem.com/UploadFile/file/20210901211640468.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/kikagususatuvosusidaxen.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/53743606915.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/dazotesimun.pdfIn PDF document text
    • http://dalaichau.com/files/dosoreluxoguvoj.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/53908713385.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/kmqmk00i6kl0kecnf3gu2ihb83/21462024438.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a63a9cac1---4235403273.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/vepugubigogoviga.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5ff5a9093---85550944201.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/jesesa.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/04cfc1e6464097f1ba56ae1decf4ef60/57963797886.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210905141014.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/bf2fb0dec1cda813bea260c841dadded/mosoziweneligalefoweliru.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/zofakarojitotuf.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/54617008352.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/tajudawumo.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/51259256045.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40db1c5a2b---13041771834.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/jabofamuvorira.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/fimejedisidodira.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/65643215686.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/5920c7b35ec81faf29d9c80a25ca2e10/xabanatej.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/pidugak.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/17924448417.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/75192136231.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBC 17672 bytes
SHA-256: 5336932d599ee333d269a4f34ee6825ce129d2387aaf39186405f06d89bd2a47
font_01_sfnt_off00011b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1