Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b4b42c528b9c09b…

MALICIOUS

PDF

76.3 KB Created: 2021-07-19 13:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b1f40835b3fa2060b278ad9932a478ea SHA-1: 7b483dcc831853b62cd877fdc86a6c7feeeb22a9 SHA-256: 2b4b42c528b9c09be22550f5f06926ad4f21b4ace8c97e93bc624f18563fc04c
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised websites, indicating an attempt to host malicious content and lure users. Heuristics indicate a link farm strategy and a visual download button lure, suggesting the primary goal is to trick users into downloading further malicious payloads. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://i-chat.tw/js/ckfinder/userfiles/files/74739627089.pdf In PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/b9uc415dsdk6lf12qrhuu5uh8i/87425947798.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606d43818ecc9---41984776930.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/zofojaxawa.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/19302654761.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160926b5b0f880---74864060996.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607db49fc7d9e---likatawiragok.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d115cd4b83---fetexe.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/puxodixugexofezobiso.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/97567935348.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1626670456.pdfIn PDF document text
    • https://slide-bearing.com/d/files/bobitigubizi.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/komugej.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0385122001625235124.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876d3ac6cb0---97701608721.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/c621bc3f98679b0361670ad18a11021c/70286794854.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/9955f33783121a55a21b734994fc6713/fijusitakubimegeve.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9e43dfa72---51303757854.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/66121696090.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7cbf7b630---bonavuveronomosowigeb.pdfIn PDF document text
    • https://activepymes.com/pub/file/mebaribife.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/900d8b6657977963a5cc35a3635f6251/fatalikogulomemuxelugura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=technical+analysis+using+multiple+timeframes+pdf+freePDF 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_off0000c6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000decc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECC 16668 bytes
SHA-256: 7de2488dd6b55cafa4b98e5e1a6f856cc7bca2b1f1151d302caab8458df150d8
font_02_sfnt_off00010a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A46 11124 bytes
SHA-256: cc52e1c7e3b24f977952aafa3b18b3c2c9b1c7af59e05219884417e1dc516055

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