Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd528551f0a94c8c…

MALICIOUS

PDF

99.2 KB Created: 2021-08-13 02:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eb040a41eb5aa14356c0867eb72fbcfd SHA-1: b5b88d61d5d7731f1075264488691c78ea94f9f4 SHA-256: fd528551f0a94c8ccccc7c20405ffd691d12f101780d8bb2c22b01e39f960953
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://irlanc.ru/uplcv?utm_term=what+is+the+poor+richard%27s+almanack PDF link annotation
    • https://viboot.com/ckfinder/userfiles/files/7228695483.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/fatabamusawugogataw.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f314dc1e60---87517051985.pdfIn PDF document text
    • http://fabtur.ru/upload/files/6279198421.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/vuxilipawalelulomedisa.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/88kog4o6mhj4udj9mdsn8e0uui/kajox.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/kogamuv.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/gl754qv68f9d45dvjd4kh71hms/kewepunupu.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8cb0c08e3---xozipoj.pdfIn PDF document text
    • http://deficanderel.com/clients/6/67/674a09facce11b7629d390eef9534ff9/File/wedivejodawimi.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/pejisizo.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707bb81a21d---vumewofoziboref.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210805211145.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/rejevixefapudaj.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/ratokewogoxugebivokow.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/73016648518.pdfIn PDF document text
    • http://school15-tyumen.ru/f/kasobijew.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c43b37360f4961a821fe9b6c00b65bd8/vexonasojik.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912f642d448---92832894382.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/1a8b401a4c4a4760dae9236a5e5723f7/nokibuzarixetasekipe.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160eca406f1d63---gejogedorikolif.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/nugaxufewuwetoziwe.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17bca7c3bb---sajik.pdfIn PDF document text
    • https://fototipia.hu/files/files/53549331557.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/pajomamelozibikavum.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_off00011f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9E 17568 bytes
SHA-256: f0065f5c27bb6f685dfe276077364feee366b045958e07f41cb98d48079c48fe
font_01_sfnt_off00014d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D46 10896 bytes
SHA-256: ebf7d90861fa8ea81393be7540e3767b192c71decb6986d26990aee6f3edcab8
font_02_sfnt_off0001665a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1665A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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