Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3ebe49725a303b…

MALICIOUS

PDF

95.5 KB Created: 2021-06-29 11:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f65cfaf7a4df124aea8a2eaee60db075 SHA-1: 628675dbe81e686c2dd67423542913fd75c67fef SHA-256: 9f3ebe49725a303bcf024b07af096b45f84d4117c529b8aff0642efa62660700
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload sites. The embedded URLs, such as 'https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b00209eecd---81924184742.pdf', are likely used to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b00209eecd---81924184742.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082861b2419f---zewelituzep.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/g0soblmoc87dkdoph46ouo26jf/felukikaboravi.pdf
    • http://ash-graphy.com/userfiles/file/lasijovovesixoxuposegefit.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/2dd4323987099eb3bb20381c3f336a02/28373641947.pdf
    • https://bancodevida.com/bancodevida/admin/images/image/file/63880940925.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c27e04bf919---43194932094.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/31b38b1bcdc3614a6617f3c6fdbf56a5/tazogezadokubisovu.pdf
    • http://zpb-maciejewski.pl/upload/fck/file/26421517264.pdf
    • http://lycee-elm.org/userfiles/file/28077179991.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/85f075545116c1f8a91cde4ea19ee3d8/98215213110.pdf
    • http://petukmahaaaraj.com/userfiles/file/gejefejepobixexagek.pdf
    • http://xn--dlek-5qa.com/admin/UserFiles/file/sitonowalijoburanilegoxa.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/878b3e8ff5946979c9e14deff80965e5/82239000767.pdf
    • http://ibshop.gr/uploads/_uploads/files/wobulab.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a19be61b5a7---66198709811.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ba39b8d8e---zixid.pdf
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/zorolemosenidonizuji.pdf
    • https://daaeportrett.no/upload/file/86826587873.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d486c476947---gikekilaz.pdf
    • https://alutat.com/data/file/77725472251.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/vuim1pthjghn0epkjld0i19s93/26515628797.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/2b306875628a0138fd9e2af5f76f2a70/90781343566.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cd347f359---wulopug.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/1c0f58db8d5a683032731c6d446a5982/gejopuwi.pdf
    • https://everestart.com/images/stories/file/35056879741.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160813851ddd33---tevixok.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=undertaker+and+michelle
    • 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_off000113ed.bin
e6ce291f8477ba8fa7e199097d2538b7be415cd8749814a8eb12270631242fe7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113ED 10444 bytes
font_01_sfnt_off00012b54.bin
45abe294afa46a62dc2465a1e96e430ea79ff1c833482c935c71c3889a9bc312		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B54 17428 bytes
font_02_sfnt_off000158b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x158B1 16792 bytes

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