Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea75be1523769509…

MALICIOUS

PDF

95.0 KB Created: 2021-08-14 04:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a870e6e960e12f4b349f758b374e47b1 SHA-1: 762fc730d53b57a56287fb51e23d83f8504c2464 SHA-256: ea75be1523769509e28b8f30a2d33dcd1e903e075494328e53a7cb29d3172031
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, and the document body was unreadable binary data.

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 https://amitadevnani.com/userfiles/file/94098092436.pdf In PDF document text
    • http://solamsys.com/userData/board/file/95902716237.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/6b18bfacb3c1c1b76935aa512f2fb234/likowajulilerilafesasona.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f95d1b5b7b9---roguzikisifa.pdfIn PDF document text
    • http://richardsonfamilyreunion.net/clients/7/79/79e100fddb184f5a3447a495e7c481fb/File/70761345050.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1610b28781f694---wafudososobukemexeri.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/kunilimevotokov.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/10761763779.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/wexexavabovuxurojaziso.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/57448046627.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/32193943686.pdfIn PDF document text
    • http://e-hane.com/files/wumogegemopasevefalu.pdfIn PDF document text
    • https://masukpt2.com/contents//files/89776362577.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090292513c42---31740126606.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759e673db78---mesoba.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/a2420ccf063300b53178ad296b04f17d/99158818100.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/342c622dc428119d15bf3958040e2b65/japado.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5ce03e94c---8188305616.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608032f8e44a1---29404270839.pdfIn PDF document text
    • http://93564497.com/userfiles/35442072734.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ec7766b77---janetovojafusudotajoda.pdfIn PDF document text
    • http://crediramasrl.it/public/file/6428549331.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/a064515bc29d99d0f635d4b1feed7b05/1879218729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=calendario+liturgico+catolico+2020+colombiaPDF 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_off00010f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F83 11056 bytes
SHA-256: 316241fc24220e0caf12469b8489575e050efe888cb0534d8d78bd4842f2d4e6
font_01_sfnt_off00012909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12909 17664 bytes
SHA-256: 50fdc23b3d49ef88d6be4bf2343e3cf3758d545470e6115afaa60117f6fa46c3
font_02_sfnt_off000154c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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