Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac22cbdc1782218…

MALICIOUS

PDF

82.6 KB Created: 2021-09-05 15:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f33edd21f88a4f13aa12b6cbc07dc163 SHA-1: 9904b15e833f3089acf8031d0ae0ab0986a76ba3 SHA-256: 7ac22cbdc17822185843f0aa9d6b7b74eb505455c10fa52e3b89d3d0cd43b1c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious content or redirect users to phishing pages. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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.
  • 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://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608532a8f133e---83314596121.pdf In PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/83623551537.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160de591c6f3c5---gijuriwuzaximage.pdfIn PDF document text
    • https://tomas-music.com/contents//files/kamuzejevokoxo.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613187c776ff7---ninedufopobaviv.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fcf122d5890---kawaxakuvutaf.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/zolilodoguduwexiwedidub.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abd8b04ee90---pedefulinazemuvivudoluv.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/59574101535.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//25443173566.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/fuzugefitavaruba.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/5klhusc5kk8oa81qkihc71n3j7/kumufokojolidupafedulurev.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/51774906831.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/93874628933.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/2735077688.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/tokosokugejijekaxow.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/4fd15c84c0251422f9d11c8e34b8f91d/levilizekivupepunawuzelik.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61ec0208d---57293463112.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec775685ad---42758836375.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160b6394e8984f---63961086945.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/kufiwurarelosev.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/73566763526.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210723_095924.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/46182372910.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/rapuzugowuxobigekegogegal.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/ff36fc8e08e4d5849cc064dac7fdabff/49526801270.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/zinomikuxegisutup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=sequencing+events+for+grade+2+worksheetsPDF 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_off0000dd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56A 17400 bytes
SHA-256: 4feeb81904cba14e09ea5e7932d09541aea16885eab153a3c5a377a7faabe31a
font_02_sfnt_off00012218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12218 11396 bytes
SHA-256: 6da46f0cea1f91a764cbb745cc75cc125964c7b08edb95157e7af76142142d43