Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4c19c75066bf26…

MALICIOUS

PDF

77.9 KB Created: 2021-09-22 14:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2db65864044e11da405dab29d1f02079 SHA-1: 4db76ebddc2417a888af90f3ce0f9e159a8a4df1 SHA-256: 1b4c19c75066bf2643e0c35861b7f8a1d89a28f310b56767adc0b708b48f2aed
154 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. The authoring application 'wkhtmltopdf' suggests it may have been generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5228

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://heuresromantiques.com/upload/files/ridopiwimosenenijuwejefe.pdf In PDF document text
    • http://fotografieindex.nl/images/uploads/10009040554.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/vl2komri33e3lt68enq16jur8t/watetogifirafawogok.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/49066573756.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144173db0acc---tawiduvutunesaxozujagazi.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/jepifuvanuxunewevalejogiw.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/finukilesonewi.pdfIn PDF document text
    • http://gurukripapublicschool.org/userfiles/file/25502767192.pdfIn PDF document text
    • http://prmakeup.com/Image/files/rototovevojolokosudifevu.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/bomesi.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/fodusuxisupuwefadewox.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210902182558887409neacwv.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202191612995637.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/givarajakeru.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/pogin.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/7151258484.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/bodenegigipawux.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614697b61f0ac---nijanudewivaviredeg.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161476ffcdbf21---vugin.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/jemezipapugasezasagefoj.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/uu8s07oacegvrpo2v4qvu0cokt/finiragujuponi.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/xonul.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/63731412359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=live+footbal+tv+apkPDF 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_off0000d7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F5 10236 bytes
SHA-256: 70343863709bc0ac73e9bd1753e248f8ff24f1a80ce63439734630aafa87064c
font_01_sfnt_off0000eeda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EC 19248 bytes
SHA-256: 95a6fe81404a06be0fd53d645c81a461bcc53466a5778bb65c5329d4ef233169

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