Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af2e393d70d6268…

MALICIOUS

PDF

81.1 KB Created: 2021-09-16 15:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1af2202c2fe8d4164cda02628fe24427 SHA-1: 39dc14322d85f18cc023485f2442f8e9e8546795 SHA-256: 3af2e393d70d6268879d021dcce966189c73289fbf34550e4db7c2f751fc3bf4
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains embedded JavaScript and external URIs, indicating a malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document is designed to trick the user into installing a fake browser extension or update. The ML classifier and ClamAV detection further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://ilkemymm.com/image/files/lepovidip.pdf In PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/59676395881.pdfIn PDF document text
    • https://alpinashop.bg/files/93803240284.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/76989284380.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/xukozulil.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/34428759152.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/zivefegulanumajelawef.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/tipilebaramonunaretibarop.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/kamibabinoxowoxotu.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/8052518656.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210910_7581EE3C329638F7.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/d67727mu3bd869iu8rnobihr32/sinopalalanotex.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/32044009203.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/bodavowakisuzo.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210906_170154.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd60e2bd9e---9836391555.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/12300143606.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/10161815108.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/lunibiguxudoxuwodotodejat.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210913231355.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/58031152830.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161346bbbef39d---tanowab.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/fegejufudewexulijodadotak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=nba+league+pass+apk+hackPDF 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_off0000d809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD809 10448 bytes
SHA-256: be6abbdc5ecf91aec2823761bfcf417d59d1e131cedbcd7e885ca06921d4c412
font_01_sfnt_off0000efbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D0 17800 bytes
SHA-256: b9bfcf86139566bdfde95ae08889a70523e75b7bbec9cfbb265b370179452b1e

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