Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56374cd28712762…

MALICIOUS

PDF

85.8 KB Created: 2021-06-29 01:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 300792b5c33136dd59de4c43e0cd3b9d SHA-1: 0a8647bb6da9f84040bc2b176d07fb5907ba9a85 SHA-256: c56374cd28712762d6b815acba2bd6ba351b358e41c39cd020bbd0bffd163095
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 and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c17083741f8---3080848760.pdf In PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b0aeae16aca---24822225882.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/51526072648.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/48910589386.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/99286978032.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/zetetujapirotokujeluv.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff9d77a742---55834855539.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/cf273798bcb38bdbac0adc5bfbc0ae5b/63451203493.pdfIn PDF document text
    • http://artospace.com/pics/file/72466421769.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/db0c287abd7a0721fa64c951b03878fa/povuzakajirapotubetutegi.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098205a40371---86898401122.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6b048f7fe---19212274919.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac75ece0f9---bogolurixiduwef.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/22f8eb6ac4efaa46b0078dbdfba42535/83408167588.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/pv3hva9b8kibh49e6kaphk6i85/zitolidosexexororixu.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/1620809575429.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/768894d4a6e546ed5c747cd1c7a8fff9/papodajanitadakubisuruv.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/vajizejepija.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/iqh5bton82c0nlr3vuitkbd129/bexeg.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pezirajipatijupebubuka.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/00oh6ei57m98n0fm9qha79cf72/1446991735.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/kisodosarodopabeganiroje.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607674966ebb8---62249867516.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/gosajazavovasubinifimufim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=i+have+two+different+colored+eyesPDF 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_off0000ebff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFF 16772 bytes
SHA-256: ef6f2afa8362e99d7c0569390722c275bd865cf5d3059b1c1ab8e589329ea167
font_01_sfnt_off00011735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11735 10788 bytes
SHA-256: 250e48575c8111ce94239811a4844c69f618dab93d7284917579f280940b91a5
font_02_sfnt_off00013016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13016 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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