Malicious PDF — malware analysis report

Static analysis result for SHA-256 220d22b700f306ee…

MALICIOUS

PDF

67.4 KB Created: 2021-10-02 13:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f933063fb972afe1f25c6209620b8d08 SHA-1: aabfb57de405628ba16f1b6b5de384ca3faae1a4 SHA-256: 220d22b700f306ee321f861aac9fbd6b72735a4c5441537bbbd894e7ac285e36
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to exploiting vulnerabilities or delivering further malicious content via the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=reversed+and+remanded PDF link annotation
    • http://audidalys.lt/ckfinder/userfiles/files/38673808580.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161484162502d0---dikariwakonalijavixum.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/35002396798.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161432ef02d4b4---84732873819.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/kavafirezakomakuturujow.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/moje8pr38ie14kdgq17artcff4/jenuninatipot.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/dinimalewumoxifegarabu.pdfIn PDF document text
    • https://kimansion.com/uploads/file/11317275927.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/22141575744.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/dexupasomefibowarufini.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/11180124113.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/30742520994.pdfIn PDF document text
    • http://scro.ru/pic/file/zigotixo.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/zukamu.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210930212406.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/o6fd4fvd3e37eai9nf2a7s5nkr/virolez.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/gakudedofo.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/50082946573.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/32609410528.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/dedut.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/balerana.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_off0000ac8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC8C 14748 bytes
SHA-256: bcbb07ebed18fdbea838cb8d76634e7df5bded8e477d8e0db0251b168aa37d62
font_01_sfnt_off0000d1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AD 10164 bytes
SHA-256: a2ceb9b37918a80f917ab15036894e3714b90cf4159e08d5ce1362df1c6cd174
font_02_sfnt_off0000e864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE864 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1