Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f1885daa6f12d7…

MALICIOUS

PDF

81.7 KB Created: 2021-09-08 03:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 23c4685f94dbd42c10c61f2f2f96405c SHA-1: 228f4b0052e3cdf04a1ff2f4e0332d0e7ac3836f SHA-256: c3f1885daa6f12d7ca5e49a78511000e6c2db3e5008fa128fc86706e53653cc3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/55b5e1557787a11f3ccc0141cf03564b/69636970577.pdf In PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/ad2200ba6a95ea795511ab59b369f7b7/pidedifadufuf.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/sivomaromudajo.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/7a177346dc0dfb3e49a57868b5a3dceb/bijavofuwalekiwagotarutaw.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/l2jjsp3q5q5lv6pq0b98d4tack/96568197481.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608134527f50d---13059891095.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc076b411a---marolef.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/9ece109fa407514a817a68997854c764/25039645339.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/liruxirugevofuzalujurupi.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610573ebebb0a---23952624452.pdfIn PDF document text
    • http://954move.com/clients/4890/File/nitipirebuwoxusopovi.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/20o4ricjtih5a8cspd37ugchm6/46796775681.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/bojamukakexekesawubi.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/56997398865.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/64836833521.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/mikiroxodolotazugusineli.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-07-16/images/files/jomewikiwitofesemuvup.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/kekapogojavoduk.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0c1cd0f8b---29907212139.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/tavojolowaworujejeso.pdfIn PDF document text
    • http://dienmaybaongoc.com/ckfinder/userfiles/files/35228374100.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fbf2932f2---1855141524.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/mamobanafoz.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/15248888876.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/jaborilusafesisoduz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=urinary+tract+diseases+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_off0000df0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0B 16560 bytes
SHA-256: 227e71fd8b181a1175881b06ad1f91611f84f0846b71f3a5bc4a3695a31e2a6f
font_01_sfnt_off00010906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10906 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001211d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211D 10568 bytes
SHA-256: a265d63a407ebd2e7a4455638179af768be650d30fa44b46058ad30cbf5ac9c0