Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7dbdaee10ad8030…

MALICIOUS

PDF

96.7 KB Created: 2021-09-03 21:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5abe29a16b76e05d558e619a28d47f12 SHA-1: 782fa37f3b6c71f4dec9bc4f7800cd01c5cfb531 SHA-256: f7dbdaee10ad8030edbb90d3c702c7124112a0b8f15d1a082221c42c56589525
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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 http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ade50b01189---kawelabovu.pdf In PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d39ce368a---48059867613.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/70721892429.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/28005158261.pdfIn PDF document text
    • https://denimder.org/resimler/files/5075127483.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a83bcab912eda3f515da36fb2b734f45/rugovif.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/74185201744.pdfIn PDF document text
    • https://stopserv.ru/files/file/vubaj.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/wovujufozap.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/07om8i59suj4ja541iqm65muto/basotogazigedoledizigixe.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/jinesowavipaxorak.pdfIn PDF document text
    • https://www.natursany.com//ckfinder/userfiles/files/340272460.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/82740205084.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/nuvubiwigulorulijimekaxa.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/birifekuputavutarerinito.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160816229cdb9c---62194406842.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/89d6e7a6b052ef249d7a025e90ad4358/gepupewipofa.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813812ed0e0---xugogibe.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images//files/76381978786.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/23625192282.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/of7mnp6rmu80hjp40itguo9n9d/vinejofapizovikumi.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/2c26c00bd67687f205d75b540eafe0d8/xewefedexuxu.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/rotuwojur.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/88257205179.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/4dc36e00b5e889df88c467befc82fb6c/16506358117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=menghadapi+sakaratul+maut+pdfPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/53400755893.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000100fc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x100FC 26796 bytes
SHA-256: 4837e8f8a4a88fcc386c88c70ea2c1681a78107440eb1630f466d36cd4f3a0c4
font_00_sfnt_off0000e7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CF 11008 bytes
SHA-256: 40bbb627a9c982cb41bea85ae4b3f049a83c480dc61496c2f8c424a642c75194
font_02_sfnt_off0001321d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321D 16528 bytes
SHA-256: a4f13726babae8e6754b0db0cd9dcb3df8032eb04b400fe21293d044f55e5986
font_03_sfnt_off00015cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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