Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa6d8d9c6c74293f…

MALICIOUS

PDF

86.3 KB Created: 2021-08-04 14:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7e5bba439223dc3a4ac0a356e521d2a1 SHA-1: c27d61018457cdfddea30dae58027185c54a9b29 SHA-256: aa6d8d9c6c74293f96903ab1bf58b3b492239eee5442812b14d232f5858b7c30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories, suggesting a phishing or redirection campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ketchas.ru/uplcv?utm_term=mathematics+for+plumbers+and+pipefitters PDF link annotation
    • http://slsnn.ru/content/files/96877076005.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608daa1117dc9---52977578809.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/juwate.pdfIn PDF document text
    • https://digireg.si/upload/86681027182.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0bfb21145---50476829536.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608d90457e2eb---davelinot.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/jerukiwivavibus.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/82823543468.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/xavujajimuvuzexel.pdfIn PDF document text
    • http://rilta.net/userfiles/files/xatifitixosusoruvurokubam.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c34ba79bf---sawakamemupefez.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/12387717541.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/c479a2fac7d028639d466d0256119235/tofejupewirezusexitiwu.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094d0bd55a7f---90568289753.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609512af2ceb9---98830219209.pdfIn PDF document text
    • http://hydrem.ru/images/file/nilog.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160b13c60d3a45---61453807278.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/53397319643.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/15385990886.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/gc53qunhr9dtmpl87mq1drcuq2/davugonitapowufu.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/sibufigidexi.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16104dc6f825ed---91071430126.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160f1d11d724ae---13186250802.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/77096366411.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/ragika.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_off0000eb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB94 17868 bytes
SHA-256: 00dd2677cf20fd4180aeb21c6c17653e40c38997a9b388b9c49fe558d9dc94a4
font_01_sfnt_off00011a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001322a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322A 11120 bytes
SHA-256: 7c47131052d1963ebb47dc0a3f6ddd95cf2f57cc78cc962558a8f1b6035c9354

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