Malicious PDF — malware analysis report

Static analysis result for SHA-256 027457201bba1aef…

MALICIOUS

PDF

93.0 KB Created: 2021-09-09 03:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 62e7fd506e40f0e6699a46f5368e99d4 SHA-1: 92e673aba61b13fe3496ae13d9b9c0e6f5555dae SHA-256: 027457201bba1aefdb8fbe0c16dd31bef7aae9109ee728b31529093f7b3d63e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript (T1059.007) suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://szallas-karpatalja.net/upload/82064693312.pdf In PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613879979e2f1---lopunojamotovulexanobi.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/32884278736.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/5638qiogp5v7l26pgv7hr30p61/nusisokalovobaxovupaz.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/bb57753b71dc7c3726e887274839c0c5/jorerugelog.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/tibusefezomuzinipatesog.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/gejur.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/bisaj.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137317431ee3---muvaxisaxexoxezigidovo.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/4750853477.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161351be8d8d95---38904567262.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/94458666003.pdfIn PDF document text
    • http://plncse.hu/php_data/file/74751372008.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/zitavilojus.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/pawupodanalejuzoxab.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/16806844844.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/hpkcahh86tmcr6fqdasqstpn7i/luruzemekifunor.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/meveturasemi.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/napipexadamemefot.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/sudikudubanakiv.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/9322298161.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/sotukofese.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/lataduwonoletalufobe.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/pajitowosebod.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/wubolewadatenamixanakuxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=tamil+movie+download+app+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC5 10392 bytes
SHA-256: 1fd64b924c8eddf50e52b42cd2052f03672cc9aaa6f700436cca8e134fe65eb7
font_01_sfnt_off00010741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10741 16652 bytes
SHA-256: 8969cde4b4a53a1daba2a78f74f159fe3210c9bac81d061a4976e121a23d0fc7
font_02_sfnt_off00011f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F03 18112 bytes
SHA-256: f9267901ecc4872c8f29fdf2f617d471093ce9a2cc76b3b7cbfbf766558452b4
font_03_sfnt_off00014d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1