Malicious PDF — malware analysis report

Static analysis result for SHA-256 8490f0f696893c33…

MALICIOUS

PDF

85.2 KB Created: 2021-06-26 12:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: c2f34d64325154ebdc4908a59bbf711a SHA-1: c45e4e8f3d532c9513e539dcd149610f7e7b265c SHA-256: 8490f0f696893c33992a8a5294b71a13c392affc82cb9c8c8c48582d97c2e5f6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely contains malicious content. The document functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. These links are likely intended to redirect users to malicious sites or for SEO manipulation. The presence of multiple external URIs and the overall structure suggest an attempt to exploit users through indirect means, possibly leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://etcad.net/np/upfile/file/87347904944.pdf In PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/15ab4f6297d48b61c9dd067441ccf71e/97237901150.pdfIn PDF document text
    • http://lowchens.org/userfiles/file/92133867936.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/sdp4lj04l0r2drobfrq15a5pg5/mizomaxolojoterulimopupu.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/midudifolomejodobotapuxi.pdfIn PDF document text
    • http://polloricowings.com/uploads/files/zunojepipatusiziwaku.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/94229980497.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/e9ad93a14d33f1c125e2161b81f25a61/wosumavinubomi.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/kiraxukubinukolasar.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160888ec5113d3---rinor.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607044b216a22---xobizujefewubodirez.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b88ee75d5---14138894119.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/2306425410.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/f5eb71678b6dcb4331f3207e55abbd27/lenobisadir.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947a817507c---sepifikemevodobiwaledev.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/0bb35bb75529274d8240c8a9c44bb296/16842582786.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ca2334485---polofikarilexamobipog.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/jevinurenevivakodorajam.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba5fa94536---11185669283.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/pudinuvoxep.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/at3uorcg02f6844ja31sfcuhlh/73973553477.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/tawugitexuvaviwomopixodab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=difference+between+mitochondria+and+chloroplastPDF 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_off0000e6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A7 11112 bytes
SHA-256: 2e3cb9e4906249b170f07ff73a8cc78b3f2609f41ac91fcf389baf0732806ec3
font_01_sfnt_off0001003b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001184d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184D 17356 bytes
SHA-256: 19bc4a32c2ef232ff930c0870921f615ca7f7228020890d547d3c97a98997061

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