Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4109b26b3da2727…

MALICIOUS

PDF

75.2 KB Created: 2021-06-26 01:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 6475c49f815973bb6a8d73e7b429f6bf SHA-1: 41774685cb40d5d231560ef6b741c28573a4074e SHA-256: b4109b26b3da2727ee3e510260aeb2c6fea6c2a77a648bc7e15f8bb67d2a28ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous links pointing to compromised WordPress sites, specifically within form upload directories, suggesting a phishing or malware distribution scheme. The PDF itself appears to be a link farm, designed to redirect users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad210c90c64---766175896.pdf In PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/pejejamavix.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/34709420459.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/d048d0244e4cd0f078d6f8d7f234048f/xuwetakedak.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/eabefac17130bae4686cc09b3a73b7d8/83672099311.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/67aff1fd2587d8aff5ae44f2acdb61ea/vozapo.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/4551f173c1c7a3f84c5e93d81800afd5/61314025025.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/cj9m8qhf10rsfm2rp6hanlq0ao/zagadaturiwoz.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/4q31ijje2459slaj15o8bcj9vg/rixipeniporarixaref.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/ad1e7682cb4f6fb0d9259f943a531c01/77000181117.pdfIn PDF document text
    • http://gyobel.it/public/file/xalurado.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/1eda0627ef85513a05eced5b1fef9f99/zepusulukufuguxiwig.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/lelabilif.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/bimoxojugabinivelasiw.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/niritedojumor.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/sebexat.pdfIn PDF document text
    • https://rotherelectric.com/files/56810440992.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceaf3534bb---zagatugobefego.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/muhs71m2hiqkrb2mmgsi6cd9b2/41934239268.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe3a05d27e---mawede.pdfIn PDF document text
    • http://wenxuezj.com/images/File/mimugejales.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/9420643605.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/8e892e900164879129ed2702df1bbe4e/wawalosarivumawojaxip.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/kanemuzem.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1c1e04413---12561356753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=the+mountain+club+at+kirkwoodPDF 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_off0000c3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF9 10848 bytes
SHA-256: b842ae0e75a991fa98669f5286de1aee1ce694a52566e1dd17061aaf601f49fc
font_02_sfnt_off0000f4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D7 16288 bytes
SHA-256: 8f98f0ae0f6fe5fffccc7ea90091e3959ea495edccc8e45ef68cca0a8286042a