Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5438cc8ad70969a…

MALICIOUS

PDF

83.5 KB Created: 2021-09-20 11:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de60f5c7cd93a8267b48a95b84bb37eb SHA-1: dc973c837e2cc562ace8fe1ee97bdfa0c591a9f7 SHA-256: e5438cc8ad70969a243455a4271afebd4660b250e97ea5ffab88436d0708120f
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=mobile+hidden+camera+apk+full+version
    • http://clevio.biz/fckUpload/file/gewigexuxevutuwibita.pdf
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/bunuvatozuxowawanosunar.pdf
    • http://likuidart.com/files/ckeditor/files/73186887833.pdf
    • http://bogaarchitetti.it/userfiles/files/776878350.pdf
    • http://kingsfci.com/userfiles/file/58419275229.pdf
    • http://strelnicebudejovice.cz/userfiles/file/viwobadapuxex.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/7ccb5c126fbd61cbaab29acc00a03c73/51681002133.pdf
    • http://skisun.it/userfiles/files/jidufetemigelawet.pdf
    • http://kaizousha.com/js/upload/files/kiruxoda.pdf
    • https://eurochen.com/UpFiles/WebEditorFiles/file/sukiwotupitovelevoba.pdf
    • http://ggbris.com/slbdavbatala/userfiles/file/21325955793.pdf
    • http://a-kamen.com/userfiles/file/56156776951.pdf
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/jopivag.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16146b0af21333---kewaborotuf.pdf
    • https://happyfun.tw/uploads/files/202109090320159757.pdf
    • http://aapltd.net/userfiles/file/84505577609.pdf
    • https://hbfilm.ca/resimler/files/lubafiluvitatap.pdf
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/18533778383.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/38581588202.pdf
    • https://ezastupitelstvo.sk/editor_uploads/system/files/tupuzegemalabugonuni.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356bf62cca8---47792148150.pdf
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/mazigexulunamozajolipuj.pdf
    • https://tiemhoamo.com/data/dulieu/files/62327540930.pdf
    • https://theshamrockpublecco.it/file/30876782300.pdf
    • http://jeykrishnaclub.com/images/file/kiruzezenopigepokixamoxol.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF71 16792 bytes
font_01_sfnt_off0000f783.bin
478195a3be98b150d53dcf64d41106070b5023103925d41d01ce7c6f8b1b5d18
pdf-font-stream PDF embedded font (sfnt) at offset 0xF783 18028 bytes
font_02_sfnt_off000126a8.bin
fe70da46c70491879ae3121d17c934d67165d4b172b492cf7ef215ecde87a61d
pdf-font-stream PDF embedded font (sfnt) at offset 0x126A8 11176 bytes