Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a43b8d7d082da33…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 11:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 67301ad17d609c2b2644054cbb3c1ea1 SHA-1: 740295a9cb5fe3219d5f003a6754e88a16179f78 SHA-256: 0a43b8d7d082da337bb946f7436b3ea98d756bf73fbc98c47141303802cf3629
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links. The file's structure and URL patterns align with common tactics for spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://drafthe.ru/uplcv?utm_term=modificador+de+voz+para+chamadas+android PDF link annotation
    • http://ducthanggroup.com/webroot/img/files/21241254409.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/mulavoduzozi.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/xegimipixed.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/miworafalevopa.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/89068186141.pdfIn PDF document text
    • http://kmsenior.org/file/files/jarogiwekigaze.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/42598758781.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/diferijepederukij.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fa2ab6096---28725577419.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134865678f56---visufegitivaxusajag.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/wusapinedovewisaluko.pdfIn PDF document text
    • https://milkywayads.com/webroot/img/files/liratufowerejumijatume.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/welofubibujowasaj.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/xotorodixozopu.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/powuborupebasa.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/nafefowopipazaz.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/wixuwix.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16145be793ba31---tixaxolezovudufiv.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/k62274v7nponatpt6jpf02jdet/duvedaf.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcdf620e10---93438890396.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/1019945325614dd21c5747d.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/kunovexagozemu.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/lanisebezopozutizo.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_off0000b101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB101 10860 bytes
SHA-256: ebd3eb91a9904a62ff36a969fd3651f05adc593029cf86f76102f6407b182c77
font_01_sfnt_off0000c9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE209 16160 bytes
SHA-256: 88c096d132db782ff5a833fa93d1b9b124e5f9a3df0dba1f528cd3c2f82a519e

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