Malicious PDF — malware analysis report

Static analysis result for SHA-256 46645da8ff0f4c77…

MALICIOUS

PDF

103.0 KB Created: 2021-06-25 18:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 85b99067413b35941d2656587c971a01 SHA-1: 84660f2dd9730a565681b75362a0bfce2b7b81e5 SHA-256: 46645da8ff0f4c771e3be727d14c9580b09083afb01f4cce50645f7dfccf5bc6
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations. The presence of numerous URLs, including those pointing to potentially malicious content, suggests an attempt to distribute phishing content or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://crysiq.ru/uplcv?utm_term=best+way+to+use+a+milk+frother PDF link annotation
    • http://brickform.cz/obrazky/files/visudupika.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/46hnclommr9b2qa4hlv56knfvd/14030464775.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd8e3cb4a0---73500832843.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/gajukolamuzokezira.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a36160fcaa---juvokul.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/88937203679.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/6874c09fc8efe1412e7ca8d6a75d8bd3/81099130658.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090b5f673fdf---rujufezuruvujem.pdfIn PDF document text
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/24565353609.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/foveluwax.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/i6n547j0rsgc0lpq0gpvgl4rn6/berekozodele.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/a75a86838f39ad3c1df0c48434291a16/xifuzubisafejavigezo.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609dffdabeed8---riborulike.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/vikonivoregumizuwiga.pdfIn PDF document text
    • https://jobtiara.com/files/files/31355536179.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075f5675f427---87014150818.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/zikiponisasudeworexala.pdfIn PDF document text
    • https://aneri12.eu/res/file/zivegukixokawovimi.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/m2rbib0qf5v423t28q88k1eu61/57405462336.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/29daeead26cdcda2d12ce294fe5c1779/wemebagijujedu.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160848f7763cdb---doninizejixikapegulu.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/91315200704.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/kitilixilofod.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_off000131d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D9 16976 bytes
SHA-256: 961b64ab4ec536297937cef754a69e33f30de0a058d22f0c878f947cc70fcfc0
font_01_sfnt_off00015ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DDB 10820 bytes
SHA-256: c9ca5087612f34a5c5e351410bc0fe17c178a3ea4339cf2096763eba97a1d0cc
font_02_sfnt_off000176f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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