Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16d8efaf689e00f…

MALICIOUS

PDF

86.9 KB Created: 2021-07-07 02:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0563b274d65b73f3a4aa9ca4b997a666 SHA-1: c8a0efadf863cf308186006d3bfaa10fd9e0d38d SHA-256: b16d8efaf689e00f7e85d495c4a04c38b5ecfa4d89bd24ff6109089684680c0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and link farm heuristics, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allytemp.ru/uplcv?utm_term=heat+stroke+and+low+blood+pressure PDF link annotation
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/cae4832342d89a7e3defd9f6a08b4daa/gawuwazeravenoduku.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/ktsd0lu7j8daen7iqllm4s3h3c/40446640697.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/695b833e7ccacc1cfe65dec8a1894f9c/51123867325.pdfIn PDF document text
    • https://aedwea.com/upload/foto/39730041644.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/zutubeluwisu.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/6836b4987bb6325959024670d9d80356/kutepegodabifesipalogul.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/febinagefemutufadejila.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9562d1d45e---kuxijekexulotasajas.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/pumuwejaduwivufo.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ffaln44jj7v2jonhn749fhail2/mifan.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/55517711446.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/wewawofekarizozezemisu.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/nexaniduduguzokan.pdfIn PDF document text
    • http://renovator.cz/files/file/tunadewokewunotedosalexa.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/fobilaxivuj.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/92cd7e57be85f98c8fc287d1924b3786/tonufiwenuzixaxid.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/58244745858.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/44820ef9ce1933d907a01963ca1f3af3/29798242979.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/addd9febb9a7fb6fd3767abb61437464/fadosadizijekizezavatosu.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/860025aad1d188d4ca31b73d4c8a4b54/lirefalewokigep.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/nawovop.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/b35kskhdc2jphclpnau98sr5tk/luxekukunija.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/337988d336057603eb1edd0d7fced522/zitezudobowenomi.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/d0b779def79598267546dec5d23b266f/fufakujase.pdfIn PDF document text
    • 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_off0000f24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A62 10700 bytes
SHA-256: 1a7419728571847f5dcedea124d50a94edb8272f38f3317b0093181d529158fb
font_02_sfnt_off000122df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DF 16752 bytes
SHA-256: b3450b776e51612a1531b50837fbad434fb3382543cf434bd591bba88b5a7161

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