Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cfbebf5af4668a4…

MALICIOUS

PDF

97.3 KB Created: 2021-09-02 10:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2f81b38033bd7cb842b4ed0d63ab9619 SHA-1: cf4a987f68284dfa3f998741afc49da0b4a23179 SHA-256: 7cfbebf5af4668a42eaf741c3937360639ae87cf7cfa28774b38308ef44ad698
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The file contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/72780ec574ee90f368de7278eec5885d/xodesex.pdf In PDF document text
    • http://pivotal-technologies.com/userfiles/file/44593408060.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/8a25ed348d26542e3055bd86d4b40b25/98318648202.pdfIn PDF document text
    • http://ohstigers66.com/clients/d/da/da15611725e7ba20b6827cbf2e24f87d/File/sajudojominebur.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077500b6f876---72796627231.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160fa46e306b49---62516655716.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/72721252292.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/41331857770.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/11efb0260720c28112f4260806c2347c/wifubipukevabalokuwokame.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/tifomazovuxezedolu.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/90986381330.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/55125112016.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/64580502275.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/xojimexopomu.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/vebigul.pdfIn PDF document text
    • http://cuiquji.net/d/files/60963588481.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/rufoxower.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/buzimaberatidaxelunadil.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/91358164731.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/84050557054.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0e720af32---34037122088.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202108/file/1629931211.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=fluorescent+meaning+in+chemistryPDF link annotation
    • 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_off00010ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA6 20348 bytes
SHA-256: 5a2b6e594bf739512f493cc41e78cbe9c9c20d28356f8e3999381fe9905603c4
font_01_sfnt_off000143f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143F3 10868 bytes
SHA-256: b495d3bc22830d63cd0e8c90bc6ca4fced068ced68367fda9cea0b080aedf50f
font_02_sfnt_off00015cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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