Malicious PDF — malware analysis report

Static analysis result for SHA-256 3057ba456b433439…

MALICIOUS

PDF

80.8 KB Created: 2021-09-08 06:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c836b47ddf53198e848cf02c6b2c17d7 SHA-1: 32cc879f55e31e4c046bb2d000204b875f247072 SHA-256: 3057ba456b4334394ecc6fe9454b12ae7d385ffb3f6aff0eff32426e9a36085b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phishing lures. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://yournew.site/wp-content/plugins/super-forms/uploads/php/files/gpvo4lbhqvgo1k6vii5ub8ajj5/26212462267.pdf In PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/02e3f273e8388e2ab0a3f08d41d2e943/vomizala.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/6165fbe1a824ec8976ed37839b29f814/revadotosusawakimis.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/jufozopalidido.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a525e8bfa96---pepiwavumizu.pdfIn PDF document text
    • http://baoveantam.info/upload/files/34125397183.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/xomovibonodaki.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/5b0bad357291cdc63f5448d48c3e4a72/vojozekokapak.pdfIn PDF document text
    • http://hkacca.com/userfiles/wakomamikulokigawakotobe.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160769a6dda55b---74446292994.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fd00a9609---29556584361.pdfIn PDF document text
    • http://poliinc.com/upload/files/30084415901.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/0tu0r12efe11v56ug3ns3cvjbs/tosuves.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/26497944568.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/15575836165.pdfIn PDF document text
    • http://idroter.org/userfiles/files/fafokivifetipexo.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c7d84f7dd---95828603481.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/10325851619.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/33102884919.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/7t7l75pnbosnjc3ufsvbofd198/7483525940.pdfIn PDF document text
    • http://alcantara.cz/data/file/larakamofexadigofuzenezi.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/49638061091.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/xezimimigoxa.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/dfae2b20d9232262e0234367edd080a2/poromobarimiwurita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=traversal+definition+pdfPDF link annotation
    • https://mediaget.com/userfiles/files/sokewosekujotowewil.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_off0000d7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE8 10520 bytes
SHA-256: efe1a50227a9de7da58973267d48e07e74a57ea46423e978ab29fc3112d2d5f0
font_02_sfnt_off000107f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F4 17768 bytes
SHA-256: 27cbcb17bc64d82cf72c37dd1d3f7c1a3e229890dd88c679fbd26bd0ef7362c8

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