Malicious PDF — malware analysis report

Static analysis result for SHA-256 0000ec533a90fc51…

MALICIOUS

PDF

58.1 KB Created: 2021-09-29 01:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 560eca6ed76a0e7db23bae7f83a2e1bb SHA-1: 20b3e3e710cf3e422e6ec6a4a4483c853946c1b2 SHA-256: 0000ec533a90fc514dcdd4d817c869cce43b955a09a2c323dd6e94b1c9e057bd
154 Risk Score

Malware Insights

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

The file is 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 PDF files hosted on various domains, some of which are flagged as compromised CMS uploads. The presence of multiple external URIs and link farm characteristics suggests an attempt to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9413

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 http://jtylek.pl/Upload/file/zugubonufemul.pdf In PDF document text
    • https://transmilenio.net/datamont/userfiles/file/gopogibisiruguxodaz.pdfIn PDF document text
    • https://bselink.com/userfiles/file/dupebatimeseruto.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/xorepi.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/guxusemubonikadelaka.pdfIn PDF document text
    • https://comfort8889.com/upload/files/kixevulu.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/fixukez.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/8a5ace961c1d4844c2fd4313af03fed2/2115395802.pdfIn PDF document text
    • http://csigikes.hu/admin/fck_upload/file/muzorilunilonobezetazo.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/wisawopusitalex.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/2489049179.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/11655818929.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/73662181005.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/zebugekevonaxezijedupujew.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/75681202812.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615380cdd411c---84147587108.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/denefanaforeloj.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161347efc49639---57413097578.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/1679475032.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/moziju.pdfIn PDF document text
    • https://mediaskills.rs/files/4395069212.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134aef4a3b95---wuzunuru.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138b1261d0f2---tewebedavimawujemuk.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/2928892396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=control+android+phone+from+pc+usbPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/dutati.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDB 18564 bytes
SHA-256: 6ba2858b34b6e59be1a385c253b5df0c8b9cbaf074a79bfbacb946af66d01de8