Malicious PDF — malware analysis report

Static analysis result for SHA-256 292ca3ffb7494310…

MALICIOUS

PDF

84.5 KB Created: 2021-09-18 19:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: da22981c6f11e0e402c447b765d95720 SHA-1: 57d40d42a4903636b01228da34fc7bbcd601f131 SHA-256: 292ca3ffb74943105fd4f07384d9a26ee4356a088f8dae82a4700dccc53ec1e9
196 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm and a browser extension installation lure. The embedded URLs and the nature of the lure suggest a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF format and the lure strongly imply JavaScript execution for payload delivery or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • 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://cructi.ru/uplcv?utm_term=how+to+make+a+screenshot+video+on+android PDF link annotation
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lutunenaduvadagosixare.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/tipirakegozono.pdfIn PDF document text
    • https://mimpidia.com/contents/files/vokawibodumi.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/bisusemuluja.pdfIn PDF document text
    • https://inarsindbari.org/uploads/7163967394.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/74797861383.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/2064744783.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/rugibuvifususag.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/voloso.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/12003730353.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613414eae9034---wupixipudagumewuxu.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/19708031451.pdfIn PDF document text
    • https://ratosatu.com/contents/files/fularofez.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/funopalokuzalifalilofoto.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e6cad53a9---dofemejukivupigelina.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/xapujetorovuda.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/jitige.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/17868285315.pdfIn PDF document text
    • http://turatabor.hu/media/girapag.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/74772263744.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/9108a948a4ccedb27ac5cb29cbba917a/liruniguv.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161398c25716e4---27644323380.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/tawulix.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE171 19136 bytes
SHA-256: 540a6f7b9b0fdb34ae4ec82edc74b781d99054004faa7f3d7b4561d2aaefe5df
font_01_sfnt_off00011300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B17 10824 bytes
SHA-256: d54e51ae32e25bf152852b04b0b65a7372678986b7b54c3026053e609d64d306

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