Malicious PDF — malware analysis report

Static analysis result for SHA-256 766e7f06211b7be5…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 23:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 63fd3e7737bf527ffaec9770e5174dc1 SHA-1: 1cd62e9dd325eb8aa447add7dc88f3fcd1aeb74b SHA-256: 766e7f06211b7be59b5f44623c6e9a76aacf2f8813d1258741ed1236ec060399
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting domains. These links are likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crysiq.ru/uplcv?utm_term=whole+step+half+step+worksheet PDF link annotation
    • http://tnslib.su/userfiles/files/41234509480.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b8deab0357---dizomezuvipurawekodewed.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/nowineterasajebid.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/94616754637.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/kesuwesiruvatilukaduboke.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109020554358245.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/66349591484.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/8116b21d8d1e5c0ce32dfc577a7905cc/logob.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/sobebotexedigafubawero.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec981873ac---xusorilakabukoguxeribek.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/5smq567k9fts0p3sqr5v4ibou7/moseduzowubonegedewonori.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/nidinujorilidajeva.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/9nfcthq8tvqou8dpvk7kji23sr/kavib.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/76607427946.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/89576327215.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/91360968217.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/56240316102.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608997d4a2f2e---vusajepizewepig.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/wofuxuruj.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/m1h6c2qc7ii9cade9ejbuu1ldr/soperixixud.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e157cb7a12---89778020322.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/7942065157.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1811c2d78---demuwopuf.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_off0000d617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD617 10428 bytes
SHA-256: 192a465dd8f86f36ce9738f586e293ea10a593338373e3704e868ede0283893f
font_01_sfnt_off0000ee05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE05 17956 bytes
SHA-256: 2202cbaeeab4942e2b034e1b2954b420623faa53ab2b543af5df3aeaf2bf34aa
font_02_sfnt_off00011ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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