Malicious PDF — malware analysis report

Static analysis result for SHA-256 e10eaad0d18766c2…

MALICIOUS

PDF

83.6 KB Created: 2021-09-05 18:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aeb188122d45976b383c7eb2346d7f3f SHA-1: cbe3cac578a8c438d37ff6538aff69a21628a870 SHA-256: e10eaad0d18766c2ffe842ca4fc3fb5d1f1adcfe27c6b3c57aae1935a80bcb4b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains a link farm pointing to compromised websites, likely designed to trick users into downloading further malicious content. Embedded JavaScript streams were also detected, suggesting potential for exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=genetic+basis+of+inheritance+notes+pdf PDF link annotation
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d468460ab78---19118642562.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc6563131a---xavafiruwakirezifuzupa.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/6fb8192655422f255cba6bdc12a4fce4/66888650980.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/56427634720.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/fe2e7b8355229971398367064a44cddd/67019963472.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/lefaxetizago.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/51693665878.pdfIn PDF document text
    • http://miltonhigh65.com/clients/874455/File/63310066471.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/56652057367.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c3daad4c3---49655786851.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/a1qe76vclt7cn2rahquhrh9r9q/tusubelakufekadovoxe.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/11989274309.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/vemonejemikojowo.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/26305072334.pdfIn PDF document text
    • https://vientangluc.com/upload/files/wovoxiwododidusaraka.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f958882e14---8874130523.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/nozuxurobezegaxakunojez.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/85000574312.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/xawavadebelavol.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/97251238545.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/2607605034.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/momezix.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f9ec1b3180b---39506467519.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/navulemufaxavite.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/93b787ae9e2e9a6608249bba213e7974/bemekobibodis.pdfIn PDF document text
    • 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_off0000decb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECB 10848 bytes
SHA-256: f99fe576b7116f185c2bf0576fe4a0cd59daba4b436debc67eb294ebe642190f
font_01_sfnt_off0000f794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF794 18556 bytes
SHA-256: 5fc29dfe70135c81c8735070ad9e0712d3f6507951e16831c274529d3642695f
font_02_sfnt_off00012845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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