Malicious PDF — malware analysis report

Static analysis result for SHA-256 021eb7559f9ce0db…

MALICIOUS

PDF

129.5 KB Created: 2021-07-22 10:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d33314eeacc4566cd1a005488f3ffebe SHA-1: ca5dcf9094b5cdb74615f00b7646796f8e13f614 SHA-256: 021eb7559f9ce0db80ba20ac633baf7e2f4860a5d376c2bca2c83519fd5948d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9736

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 https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160784f5436136---fewejufometapobuj.pdf In PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb05dc50ca9---5499678800.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e2027bef39e---97494790530.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/160738428ab3f7---fusuwisunoxabotaja.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/zigidepuxupig.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160999c6e81cb4---79750904342.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/0f421db1e3b86ade6fe1bd2f036c1338/pexawafigukesedelupapulol.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/e93bp12tmq1nts0jv70e5q6ttu/burebakakowu.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/fadekapogako.pdfIn PDF document text
    • http://scmsalliance.com/clients/864514/File/xevanuxadiwowa.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210513103049.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/909715bab96b5ffe81f53cb9a14a33b1/28055711969.pdfIn PDF document text
    • https://invest.pl/userfiles/file/muloxexoxezulopidewarogak.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/69707258248.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/7115d2d977dd3406c9380e91eedb79d9/pepomame.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f4e89d977d2ce8d61366025214ea4894/kavar.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/sidijedixalodadulofizumev.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e54d9b02244---kupegoketasogevige.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/jk299ncbuv3nc5ad2ehv2emog0/20645594891.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160795660b13e5---80170379163.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/751t463jnl9urgqcdvalcvtoc0/21100618531.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/c5cb16fd782c14f921e222a2b8b17c23/rolujilekoba.pdfIn PDF document text
    • http://nensi.si/upload/file/gusobazerodikamew.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/01c377655d3596b4821ba9b9628f4934/velamodiburumizija.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/a7d852c1fee45947658ae3f1fdc6c2ed/mawoju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=bible+study+on+vision+pdfPDF 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_off000196f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196F1 10700 bytes
SHA-256: 6d2d6717fa7aa1fc129083c057ada6bae9998b494dc0a4328e4bc0d7e55e9c08
font_01_sfnt_off0001af70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF70 18004 bytes
SHA-256: d51f4d87ba800fda54587935d03f77460e4a025a1223aa9033627cd59687ae56
font_02_sfnt_off0001dea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DEA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1