Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7683426898a6c26…

MALICIOUS

PDF

86.2 KB Created: 2021-09-06 20:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d03dd0d9eca0a3f0a0846232af483dab SHA-1: 7cb4d4f1b7b3bb40759b13bf25f62d4d37820348 SHA-256: a7683426898a6c260006edd33d82d3cd95ce6967028af2f7d8111bcc88ed9fe1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://queure.ru/uplcv?utm_term=bitdefender+gravityzone+elite+pdf PDF link annotation
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c265c8ac81b---jedenugesi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf0e8b9007---zigifupunom.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861b554397e---67153088960.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/56458624bbb9a85a7f7f252d3498e03d/kebusog.pdfIn PDF document text
    • http://agenziadiviaggiocagliari.it/file/18312980408.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/95067460063.pdfIn PDF document text
    • https://blugarden.eu/file/bunawife.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/nelifazoraletumuvodoguka.pdfIn PDF document text
    • https://ovalpolycoats.com/media/jilakabore.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/76193195825.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/bc8fab9175c615997c4c4c2a07d6e091/fizabakidevifigurezasilu.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/54710911499.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/jalovoje.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d206e6c323---gekelivomavasetejoxo.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/12794412122.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f500276e2d---32930782708.pdfIn PDF document text
    • https://istanajp.net/contents/files/65914459733.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/5665879277.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/wiporotexudox.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/sutixudusabafukulef.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/93597105877.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/7f9d306osqldn6alvsli69vdh0/wowewulaxetud.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/49991532568.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e7c61a244---zowosubobeda.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/74986038726.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/68308589014.pdfIn PDF document text
    • http://air-con.ru/upload/files/22266154076.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_off0000ec19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001042b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042B 17648 bytes
SHA-256: d05c75394739759c21d443e4a17f244f8a474ccaf1159bf933db40c28146391f
font_02_sfnt_off000131ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AB 10800 bytes
SHA-256: 590cf6c979219d53b1d0a8fe5e5bb22ffba75d87d046e81c7896ae9958c67557

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