Malicious PDF — malware analysis report

Static analysis result for SHA-256 4984367e06aec896…

MALICIOUS

PDF

69.6 KB Created: 2021-09-14 18:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 65b72fe15dc6c562bc82cdc0795a988a SHA-1: c4c734d9b476f5e74bd8b753661522fd1f830772 SHA-256: 4984367e06aec896c094bee50066295980c749c8d0e716f282055830e651d82d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests the PDF is part of a link farm hosted on compromised WordPress sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://inwebjor.ru/uplcv?utm_term=every+skin+in+fortnite+2021 PDF link annotation
    • http://3asoft.vn/img/files/51368981275.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/bemeniveruwukukok.pdfIn PDF document text
    • https://porfic.com/fotos/file/26648749499.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210904190145632162h105i.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e5bbc7869---dakiboloxotafikebat.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613194fb68a5e---87848590716.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021090921234893.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/76919053397.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/903e06c3f5081ab40e5a30f31c4434a2/12812789588.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/98384303348.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/a73451d8d92f3837eadf20fa847bc7f8/kidakijumuzorapef.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/74985848229.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/sepejilowotosipakot.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/98608596437.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/53150518814.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/81287571645.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/zumamemajeretanopogemo.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/61411938599.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/nulawedojosunepezurox.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/58349247841.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/xidilakakugij.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/tokuvubov.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16131483f78f6a---wasutef.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/jejagijebalojukuzoxuvu.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_off0000b296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB296 15088 bytes
SHA-256: 89b6c5a058cead8cca7c994aa0be8e3b9be2e84d00cc08f4e693c480aa3b271a
font_01_sfnt_off0000d85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85D 10548 bytes
SHA-256: 18859d048dea32e65c6f9b49a80dc2406e951b573d7b75f17198bdf9218332f0
font_02_sfnt_off0000f0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1