Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d29626a26610a9…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 18:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 028abf168ba8a1defd0f81271da9ae7f SHA-1: 3f6ee4e30bb0c67d704bc37ea32e55d50a2c283d SHA-256: 33d29626a26610a9377694ba8f0482d3a402b472f784b444b36e668801857099
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs users to open a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://chcial.ru/uplcv?utm_term=how+to+turn+off+safe+mode+on+your+phone PDF link annotation
    • https://wfca-czech.cz/temp/userfiles/files/kamofu.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/pewoxijo.pdfIn PDF document text
    • http://synergyproperty.com/images/files/37847263438.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/vp9767bp01hlee426eeto7mqjq/mejiku.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/goganebaf.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/53186389528.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/giburodizorunebiku.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/e72fda635af81e5d9e1a99ae9493a5c6/55242687709.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/puxiwexekupabed.pdfIn PDF document text
    • http://chengzechem.com/upload/files/zumeguganofisuxida.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/76629460297.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/7929404139.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/fezawuwubuwujibujuwujogoz.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/xewelor.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090112494939.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/36052679467.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/kamovilitavabaxolera.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1lt75lpusqunfe1jnjkrd2vkn0/misovixojulamilojebek.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134085282433---84303402020.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/bazuwewolanez.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/gasozapodi.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210915160212.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/gejupazipusojerobujo.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA1 10916 bytes
SHA-256: 833df9f205b9500114cbf25fd615b0072538f09cea28cc7fe844020439b41a75
font_02_sfnt_off000108c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C7 18148 bytes
SHA-256: 754d3a7c61c0b061a5d061429676d2d695921e93eadc6a186d3eff2dbf90635d

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