Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e9d6e84aacb52c8…

MALICIOUS

PDF

73.5 KB Created: 2021-07-12 23:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 10024fb325d3761fcd11c0ced5d2b046 SHA-1: 99978f3a9562ebf62ad442559afb17f99158b812 SHA-256: 5e9d6e84aacb52c88b9fc8f10d0eaff4da28a4c5644fb974afc595c378b98284
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal that the document functions as a link farm, directing users to multiple compromised WordPress sites and other disposable hosting domains. The embedded URLs, such as 'https://archism.ru/uplcv?utm_term=android+studio+night+mode', are likely used to distribute phishing content or further malware. The document's structure and the nature of the linked sites suggest it is part of a phishing campaign or a malware distribution scheme.

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://archism.ru/uplcv?utm_term=android+studio+night+mode PDF link annotation
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/0e26114abdd18e4c26d73e5339267672/sulexelunewimejeduwetugu.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/lusovekovezel.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d33cf65c03---fizezomafegejekozutokow.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2ac682d19---65123391713.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf29f0cf5fd---gulowulalubu.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/725aab174e9353571d3ee9a27fb07928/86178935401.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/p07gtqru3a2qlnrvh4fjaggccd/sajot.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/28295567337.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/dabc60d16ea29ae0dc362e0e537c2967/dasazino.pdfIn PDF document text
    • http://whitefamilyreunion2020.org/clients/4/4c/4c64578d40ee165aaf486c9a1ef3309b/File/80251999710.pdfIn PDF document text
    • https://edebmachine.com/images/media/files/sivubusuzeje.pdfIn PDF document text
    • http://sns.hu/_user/file/zagesazipepud.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/71111623c9f55c5954bc631a2385849e/xoxerikimosawisozisaduwu.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/47431431902.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/52946996301.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab994b39f8f---83051471112.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16085333ca112b---67667318730.pdfIn PDF document text
    • https://htddienstverlening.nl/userfiles/file/xejeponu.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/4e67557d3bbb9b394939cccee327a981/63330017477.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/enljvvajgtava9p2a15dbeth62/38218715196.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b590c7c246---49164435846.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB695 16188 bytes
SHA-256: 0a2a9992c963c8e613ebc5b64ae7aa35e3cbf867fafc45f1a2af2ef4d11165a2
font_01_sfnt_off0000e0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C6 1696 bytes
SHA-256: 28c5bcedffb0f63c0f18ed07264126f7c833899b916de9a351f9850be7cb6bae
font_02_sfnt_off0000e8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000100ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100ED 10568 bytes
SHA-256: 8d616973585937caa07ccb39f52eabffc24cf9b619520f489281e341cbef2324

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