Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7b5c9000e36723…

MALICIOUS

PDF

130.8 KB Created: 2021-12-07 16:56:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-18
MD5: 313b89aa297bef8ad14db1433acfa7fc SHA-1: 4cad60741724caac8c4b597e9279b3bc4662a86d SHA-256: cd7b5c9000e367233498ec95c35b51054c77974c583fc2acbc65704ad9ac3090
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous external links, many pointing to compromised CMS upload storage and disposable hosting, strongly suggests a phishing or malware distribution campaign. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9763

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crv.dascalita.ro/app/webroot/files/userfiles/files/lapul.pdf In PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/c86c7bed690fb94421bdcbea774d0b01/tipoxixojizudira.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/49326082934.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/binab.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///50753880652.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/63435366103.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/gadipevofilefebelenaxeko.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/teludekegekomepenolosep.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/9d3bf3f59b9f03a4c43e08a06361e078/bujivetesezidibu.pdfIn PDF document text
    • http://pronobile.com/catalog/file/loruxezesi.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/75951361187.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/94376377422.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/lusun.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/lawilozo.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/bivoxezozepujawugowevitun.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/gusipokonive.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161677795918f7---kuzonawofij.pdfIn PDF document text
    • https://vitanov.rs/files/lowomuligokoduvu.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/kilufigalekaf.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/5205845559.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1619e889999615---fuxureradexusinorefu.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/4870947003.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616ed07a6cbd3---17868146493.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/97688706053.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/fururosozezafipebutune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/2I9n2o-U8HI/uplcv?utm_term=ejercicios+suma+y+resta+de+fracciones+con+diferente+denominador+pdfPDF 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_off000197ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197EF 20040 bytes
SHA-256: 7956a40e679e1dad260cabc7ec53e6a0014f9746d43a30a3658c4dcafd88dfcb
font_01_sfnt_off0001cae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CAE0 16416 bytes
SHA-256: cfa2c3fbce80cc5607e01af033b793d17c57c214fb1d96e845eedea48cccd336
font_02_sfnt_off0001e184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E184 11060 bytes
SHA-256: 1fa00d0413988d4f0389fd82607592f8852aa36c88053e0eafc173456393bd98

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