Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e3838ca203af3b8…

MALICIOUS

PDF

79.3 KB Created: 2021-09-18 23:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 30c1fb05a32b410f0e4be500f659881d SHA-1: 1afd3186100f351286ebf07d292fb90d7e8f3bf3 SHA-256: 1e3838ca203af3b8133f0e2136e71e788fe58f3a8ac953cca5ca8be7530003e3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms points to the T1566.001 (Spearphishing Attachment) technique, as this is a common delivery method for such documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://allytemp.ru/uplcv?utm_term=sims+5+android PDF link annotation
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161445e2c46594---lexoti.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/88080390790.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/keribifonin.pdfIn PDF document text
    • http://pololanna.com/user_img/files/punetadosadoja.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/97207273544.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/povavu.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/22992356432.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/16946738153.pdfIn PDF document text
    • https://comfort8889.com/upload/files/rujeturolefipojerudaver.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/pejuligopedaxakisika.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/b92d078c9c6578fbfcf877a913c6833d/61141101609.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f038106447---supusepi.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/70227008974.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/62923829664.pdfIn PDF document text
    • https://maymac.info/userfiles/file/xulipeliteropodi.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132195446c78---desurifemojukekobumevesu.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/64244532632.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/64236062462.pdfIn PDF document text
    • http://a899.net/userfiles/file/34488490692.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/nagojovonopikoma.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143d156612e8---86081669662.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/fefamiziriju.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_off0000d23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4F 18128 bytes
SHA-256: c666e6f960fdea1aa7265faf16652f312ed1be42fdb3ca10a984688961cb0325
font_02_sfnt_off0001190a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190A 10344 bytes
SHA-256: fb1554f0ff0a41a53e13e0b86f2af1d6d713ab131606082a4cdb16b9c8b6cdad