Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a0c109eb48db483…

MALICIOUS

PDF

76.3 KB Created: 2021-06-27 07:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: edd3e3c15c26d7feeca008d5d618272f SHA-1: 55b6914843b3f6a80a48d5594396da08c6a19d7a SHA-256: 1a0c109eb48db4836b99c1087635a19de1f8a53a4669bdbf925593eb08abc833
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content or phish users. The presence of multiple external URIs and link farm characteristics indicates a deliberate effort to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078257ba3d36---80615095322.pdf
    • http://lavalnerina.it/userfiles/file/rizutajavuken.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d2aa13ecd---30160812391.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bf776063b---jidexelewowafesalija.pdf
    • http://ahxxzx.com/userfiles/202105/file/52335699860.pdf
    • http://petrduchek.com/files/nadotevanibabesefanudupej.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077dbedeb71e---25402386061.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4664cccfda---punokeliwowij.pdf
    • http://stepasidemedical.com/images/uploads/file/fizapotajatutibekubele.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c2450c391---wadewegugetiloka.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609273b0745e9---komekipibirov.pdf
    • https://cambodiaangkorhomestay.com/userfiles/file/52374408351.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743ecf4f90e---18208110760.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/cda4aa35361b3a730e8c36eef99de824/29107181694.pdf
    • https://comobrew.com/newsite/images/user_uploads/file/tedubepemipebiz.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988a97acda2---niguvafevi.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/72174e59469a17ab830697d2a958c3b8/zovaparapenabaju.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa990c688d4---87187262394.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/d0f2b86cdfbb5d5c19ec78102d397c80/xowoterol.pdf
    • http://adveotec.com/img/file/tatutuwafiwonasobujuvugaw.pdf
    • https://clubesolbra.com/uploads/files/vetefiwakinedefekipodewix.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/rpni1928mjddnme7195b23l7ro/fesigepo.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a017166012e---9660514526.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a38c873dc62b6c471d5ed0109f42dba9/49201209218.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=currency+converter+pounds+to+dollars
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6ed.bin
f8ad02d99750b81591c679ebe13514f0cf66f13e43a1eefa3b0d1ef9e9c5b200		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6ED 10724 bytes
font_01_sfnt_off0000dfc8.bin
a1508c59730cd7d48cab401b78a10f86c2a72b7ba2c3ca1a4aa03b105a5bbb94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC8 16172 bytes
font_02_sfnt_off000109cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109CC 16792 bytes

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