Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c735afe5bf1ed9…

MALICIOUS

PDF

96.6 KB Created: 2021-06-30 07:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: ab37296ec5ad834f478ac93ff6a07da7 SHA-1: f53760f3bc367cb9ee3b43182b68839e86b76618 SHA-256: c5c735afe5bf1ed93d7053a6d79d37bef8ff24fe59889a7befe5273af3fba25e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these linked sites. The document body is unreadable binary data, but the heuristics and URLs point to a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://luminex.pl/upload/file/jogidovofamogavuretiz.pdf In PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1606cde5e732ec---nulunesefoporitujetigufug.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160869a7d65d65---31770567475.pdfIn PDF document text
    • http://centralwestwoodclassof1983.com/clients/c/cd/cd4b3c89dd1500142a52f05b9125c350/File/64333978835.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/942a92a38bc6a260e75528269be735f4/gekakezatusugi.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160855d0ba15c3---99345488998.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/6pusv6tn4erap8dcov5veml6b5/runokonimabubidunu.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/rabufovarotemidozeresax.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/fowoluputabitak.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/44368092051.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/759c191e10ed0eb6d975bb681865369f/zarototazefogemi.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073f63a51b3b---66284744258.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/9d901ef61233ddc60053a0de4ffcd3f3/17921009761.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/17974305095.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/67678663193.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/qg6cvuo23p3arced2vitqo170c/59576826926.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/84vrg4ed35m9lgg9ck5ip69v55/7114132756.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be43af3dad5---54861462312.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/vojisuxifexelolawi.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/67bdf9a69510f7cf47110de85bf08b2d/98532316771.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/gekegobe.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/nukizokivasav.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210629182927_wlgz9a.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf8d312c0c---68702861127.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/c7f72b068288572d63be5fb87059dd2a/moxokovaxatebafunodul.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/gigajozedavejapililo.pdfIn PDF document text
    • https://afayl.com/userfiles/file/2625462098.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=another+word+for+come+truePDF 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_off0001162b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162B 17568 bytes
SHA-256: 38bbfb979f057c004aebb3364e0ab56d3d5e010b16ff149a5ffbe7e1f5a73ee1
font_01_sfnt_off000143f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C0D 10440 bytes
SHA-256: a0ab188a1213f8021acab9b8f22c6759a7a4d020c02b5bc57981367f2dbe7641

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