Malicious PDF — malware analysis report

Static analysis result for SHA-256 49124ee1b5bed7da…

MALICIOUS

PDF

78.1 KB Created: 2021-09-06 07:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 13d73300fd2824fbf6a5d759a747795f SHA-1: 4789b14a8b7575c8f7f2407b69d333732d46f8b9 SHA-256: 49124ee1b5bed7da642a3450c7384f73684811835b779cfa0181cddb22bbb28f
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing pages. The document's structure and embedded URLs suggest it's designed to exploit user trust by appearing as a legitimate document, leading them to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160757ec75ff90---26589105539.pdf In PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086eb8f822db---5794076303.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/80b20bedcc24c4efd1f5793c5b3e8162/78312640039.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/e3be77e4a44641c527572b60cb0f6ef0/29197995373.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210527092602.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/rojewelozadadebopujikonog.pdfIn PDF document text
    • http://xn----7sbabjkhbzbqti4a3apfmdd2s4b.xn--p1ai/ckfinder/userfiles/files/gutigeviripe.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908630c8875---19126667783.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1609d65381cb90---61626015200.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/f57e12d6bddb2904d684c62b66f380e7/jubeweniw.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd632a7885---joxivigarukogudabo.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/86277689554.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/xelulorepime.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///64741332063.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/74770707675.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/jifexo.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/gawufojepogefimoxoku.pdfIn PDF document text
    • http://whitepurdeespires.com/clients/b/ba/ba703c466af5784ee38134b9d09df413/File/zanovunevomemimof.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/41164870813.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/xedexusufusafado.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/97c61efbd0eb0d31698fe725c4aa9f81/71666832441.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/348596889.pdfIn PDF document text
    • https://datajournonepal.org/files/lapipuzudukivo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=econometrics+exam+pdfPDF 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_off0000ccb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CC 10820 bytes
SHA-256: d51b85be57a783c65a99edd9a78ae902120b25417ddf54750f9be3e6665d32ba
font_02_sfnt_off0000fdbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBC 17440 bytes
SHA-256: b7fab3244cceda7b1cb2d3ec6bf694b785d7a4d982b54aa225f135ab7b11b0c6

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