Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5e5f13e49d6d4a…

MALICIOUS

PDF

72.0 KB Created: 2021-08-28 08:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 610cb3e28ce4a6bcb9dab83dced8ed9c SHA-1: b2cacd694269630bcb1ad9a7eab61762f7cd9f18 SHA-256: 5a5e5f13e49d6d4a43ca142b253088bc4151bd7de87e9b0c15a6a1a8aa32f447
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and an ML classifier indicated maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The document body was unreadable, but the presence of numerous links to potentially compromised sites strongly indicates a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9442a0ca3---sekiwigaxugez.pdf In PDF document text
    • http://okwmd.com/upload/fckeditor/file/midap.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/xunugojarebasizegi.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/muwaburam.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9cd307825---nulikowupepifotabom.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/5517973761.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/90197496791.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/1f54e23c8993b01cc5b1d3f78dabfa7c/60320091846.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/6260502423.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/38919854717.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/t811r896pgf0nr9rn9guqgk17i/8370011401.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b864d30e4fb---45306568425.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160857562c460c---duxodonida.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/janonenetola.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/e58617b7514c558ce069bba41439713a/sologozen.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/kogesilujabilad.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/06e77le01fb9uct9vblm1fckrp/66133762107.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/girimubumep.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/pesumozon.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b0dced07d---lofaju.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/gajul.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800e44f1469---59414714137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=company%27s+coming+appetizersPDF 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_off0000b5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C4 16896 bytes
SHA-256: 357c239dcab4c27628dcbdceadf458950d4590593f41d331f1ee7964ecca1bce
font_01_sfnt_off0000e195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE195 10912 bytes
SHA-256: 4381e0389ac7c4c96afc5b3bba21fabedf54aa7bb3d69e905a4076ecba409b2a
font_02_sfnt_off0000fafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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