Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc006d5f140b1dab…

MALICIOUS

PDF

69.6 KB Created: 2021-09-26 18:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 63613ed8f045042e3db008c0f4eefaf6 SHA-1: 16c5bbdccd52f53180aee630ef3195487fb5c7ae SHA-256: cc006d5f140b1dab53d6691e11a44b93f962ebaf2114b4d63653b0da3a05aa3d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with high confidence. It contains embedded JavaScript and multiple URLs, some of which point to compromised WordPress sites and are part of a link farm, suggesting an attempt to lure users to malicious content. The embedded JavaScript likely serves to execute malicious code or redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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
  • 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 https://szallas-karpatalja.net/upload/79185657442.pdf In PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141d8eda4cc1---zewalevepokinadunojas.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/52019100964.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/93217001192.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/biwobe.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/12974915713.pdfIn PDF document text
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/dubimodabekiradomo.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jifavubamodesesatusi.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364bf383136---31330167032.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/84448239751.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/lirexop.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/xiketajikeduju.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/fekafimuginaroxagabo.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/50573793447.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/16031819013.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/32173981328.pdfIn PDF document text
    • http://www.polni.si/Images/files/zuxude.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/92982644688.pdfIn PDF document text
    • http://parfumland.sk/upl/60805136702.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/46887573450.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613101bb28ea2---zulatum.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/dogimive.pdfIn PDF document text
    • http://premo.at/userfiles/file/62273053431.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/xatubex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=cool+fonts+apk+downloadPDF 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_off0000b31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31B 15024 bytes
SHA-256: 9a0d4e75f53e518af5ead3810a19c8466fd4da2fea4f48af70f124cb63dbf832
font_01_sfnt_off0000d8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D8 10376 bytes
SHA-256: 6713ba03cdd45c82111a6536abe7ff513e69295325ebd9c6a075a88a7529e387
font_02_sfnt_off0000f089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF089 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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