Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb839a129bc1495c…

MALICIOUS

PDF

69.9 KB Created: 2021-09-03 20:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ce18d8e2ac6fb907a9ce9e98cd86e241 SHA-1: 840a03d1cfb14ce140c8ee9b873b8bdf719b70f6 SHA-256: fb839a129bc1495c5d55167ac94c39974c421d8cbeaeb8065d784265d1044c3d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content or phishing sites. The presence of multiple external URIs and link farm characteristics strongly suggests a malicious intent to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://sibservis.com/ckfinder/userfiles/files/remeligapajalexabexato.pdf In PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/29879220766.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/78q6724i0b1kk1520r331nrm14/jadoga.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/eb7d58fa4841378efeb2c67d0beeca33/39641371057.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/2038831824.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/26a9412a8413ed2c6f8ec7d92a15bb5a/51387924676.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/3db256ioboucmmvvpcg50h76nc/merogajefabanikifuta.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba96fd1dd7---mapejaxu.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/6ba3a0b7141ada83b8ec7ee966406fd2/mufukixod.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/voxuzamigufodajipisi.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/f653add4ddd06b7bb86bc25fcabd69e3/femoropetasisolosudex.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/f3f03fc6d38efc5ebeabe4875e39415f/besamivejopededikefapor.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/bojipari.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c53a7b7fcd---76298491457.pdfIn PDF document text
    • https://memoservicesrl.it/file/19524463628.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a1091a7da---45017206741.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608048a334893---81749163049.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/49501340045.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/51259495614.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/9e1516e455362bb11a269405e25ac9fb/vumufenevanojolalujuj.pdfIn PDF document text
    • https://orangerun.re/photo/files/1287799944.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/rikipinexetamopupamilipi.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/063805884fa9572f520856112630691c/degufogudupoxun.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/55139657475.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/sodhvcpgrbjd5kmpart7hisn9i/kijixejapibemoruraladi.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/jbiunpr5j4vsv0ans47175scnt/depojon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=number+worksheets+printablePDF 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_off0000b407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB407 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1E 10912 bytes
SHA-256: 132546670bc6519614667e2e2bb0b9454efd358fa2acfdcb86ed23602a28d5ed
font_02_sfnt_off0000e50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50A 15312 bytes
SHA-256: ccd643c899c40dcc255e2bf11313f39951a20e80f195790492480c8aef20cae8

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