Malicious PDF — malware analysis report

Static analysis result for SHA-256 adef1b9a1fab8ff1…

MALICIOUS

PDF

98.8 KB Created: 2021-06-26 17:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: d3c70e55701e3365a478040cf3da4bb5 SHA-1: 9ed68e090b5ca388c345341970e2f769ca324298 SHA-256: adef1b9a1fab8ff1fd86f0716be23abb11a6a199052948cfaceeaf54716fda30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other domains, suggesting it's part of a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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://cructi.ru/uplcv?utm_term=free+streaming+movie+sites PDF link annotation
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca33664121---togagudogivuvofifisix.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/tumonikenilivewu.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/bovif.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f941ab872---zifobogigogenur.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607018fff078b---19167889647.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a965fd1650.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/wavagijatiboligoburuvor.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609215a008542---zepudutavugesozazimiwuxos.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210617_AF9973218C5238BD.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/vazuzidika.pdfIn PDF document text
    • http://aplus.to/userfiles/file/xaxekugoledufuveziza.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608a95a2bb791---vusidinobibobegezedolebo.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6898463be---mavalegometumuze.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/fulutenilonuzupofobibite.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080c80df2bd2---fuwojatetofomirerirebatot.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/26694909623.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b857520dbf6---zokol.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608439ad2ede2---91096424022.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb27c65e15a---29477210096.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a415a664a43---xaribokimetafukotapadugej.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ba98ed924---satinone.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/afb2b04f15b53baae7b566e855bf800a/vejenewo.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/rekivomexogigiluxaru.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/7cffdbff3870eac914ee7428531bd22e/89502995734.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/didevexozafusikut.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60BD5245968A5.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/67112596263.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_off00011e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13640 17648 bytes
SHA-256: b4a17918327a6111a05e39d2cdc0c75f2000d5abaa955ae82984c3faef2186a2
font_02_sfnt_off000164c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164C2 10448 bytes
SHA-256: 3d3b97a493983607c8df0ddd739d96e5a253c8365dbb352948609937f97a6ab9

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