Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a72390081d52b85…

MALICIOUS

PDF

74.3 KB Created: 2021-09-03 07:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 94ab78e1da696e78cf5cf41d5cdfa499 SHA-1: 6108bdc7144dffdc6cefce36b85b134ab2baa66f SHA-256: 3a72390081d52b85bd9dfd27cb9e4002b4f54b90f365e68198c64e91f2eb3321
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, hosting numerous links on compromised WordPress sites, which is a common tactic for phishing or distributing further malware. Embedded JavaScript streams are present, suggesting potential for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ietc-oman.com/userfiles/files/33992477385.pdf In PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa086a67c9f---samupukut.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/88450626865.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b56f452592b---bivabegorum.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/32dbc732a22dd2ef2c044e3c40093317/posej.pdfIn PDF document text
    • https://viettrungson.com/media//Files/fimopawovovore.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/puxezosoxa.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/56301690649.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/kixadeduluzumewez.pdfIn PDF document text
    • http://ippon.lv/uploads/File/64741743920.pdfIn PDF document text
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/68418312042.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd3cfc59e7---nilosetenikorejivuj.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/nekapise.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a8460d3b1e8---35857552387.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a884d85a0---38616006798.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a00b6de702---4454642467.pdfIn PDF document text
    • http://caythuocnam.org/images/files/fitoledojos.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/farifilezabuvozugajugil.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba7237938---ranitumakubisupega.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/3cds3qompj98op2om8s3oaq8q5/94249262035.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/vivoxavanaxawetipulabe.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612939063f8a7---tamozavapapamomazara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=simple+and+compound+verbs+worksheetPDF 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_off0000c138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC138 15848 bytes
SHA-256: 21969a9201a14fa91d8bd2b742d02d17f83fd48f5a14de2d6ac07b74419b026b
font_01_sfnt_off0000e95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10173 11340 bytes
SHA-256: 7f0c03a9d23f0b759dc1120a3ffffd731637ce65b6d8b728732216e23d0e7f8c

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