Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb09eabf6bc5b2bc…

MALICIOUS

PDF

81.8 KB Created: 2021-09-28 17:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8bf8366c6b9523217da4dab01da9056c SHA-1: ef4ca5b55255dad73bc617bc1e7f036566ae091c SHA-256: cb09eabf6bc5b2bc99a6664fdbb3b92ef1ca2151ef1f2ea706d6bb89d20c8602
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of 'utm_term' in one URL suggests a tracking mechanism for user engagement with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://chcial.ru/uplcv?utm_term=cs+counter+strike+apk PDF link annotation
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303ab5791db---mokobutuxugozox.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/89605126208.pdfIn PDF document text
    • http://caythuocnam.org/images/files/36716125382.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/labanuzizanoximodax.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/72871318936.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/zezafubotamelefirimut.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/54526239976.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/mogijipogewimumakumumu.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/54166725426.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/wifedoporijalurumujilega.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b905f5dd56---zedivolid.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/vogadafolabo.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/35873323743.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/mofuvowatukitetinuvajoto.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/fufebow.pdfIn PDF document text
    • http://ippon.lv/uploads/File/xesagunakufuma.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/93627247439.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109180122554737.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/mabujuvuma.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151824a4cb7c---miritukovomezew.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/66022632056.pdfIn PDF document text
    • http://www.buildonhope.org/file/fitinesunejam.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210902192511650.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/941850eac146d86c694758c98fe3eea4/rixorogikidajiwixikezu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF63 20252 bytes
SHA-256: 3218ef5abb2a70719f9991edd74451888a297da12632a1a33ef0dd3f2cdca745
font_01_sfnt_off0000f321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF321 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B38 10544 bytes
SHA-256: 28c35db8f5f8166fd3ea712e2484b20167ae2adb8be5ec4daee5fcf385038418
font_03_sfnt_off0001236c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236C 16188 bytes
SHA-256: 800554d3d6320da9c8ab21a3ad3d270f40e7a92360d7538c059d647d952d1d34

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