Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca05780dc443bff…

MALICIOUS

PDF

83.9 KB Created: 2021-09-16 01:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 622d5d14f89991b84bc11d458d52b3b6 SHA-1: 1e1f55b307e5468075782aaa25a97a8fcf352bba SHA-256: 8ca05780dc443bff9b3ac52060ac0984e3198630fe47010e1f0cf7c493b6208e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is classified as malicious by ML and ClamAV, and heuristics indicate it uses a social-engineering lure to prompt the user to install a browser extension or update. The document also contains numerous links to external sites, some hosted on compromised WordPress installations, suggesting it may be part of a phishing or malware distribution campaign. No scripts were extracted, but the presence of external links and the lure indicate a high likelihood of further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://huntic.ru/uplcv?utm_term=how+to+stop+ads+in+shareit PDF link annotation
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e93f08ad886aebb77df60f1df426482b/welabesidekevakanorebex.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/vibonenevigapijarubav.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a74e614a17---52258967991.pdfIn PDF document text
    • http://xfswchem.com/upload/files/setuxutixe.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338981baeaf---kaweka.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/malokal.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/79624271546.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/67762398575.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/39645524017.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/xamigotafubazusaw.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed06de5ea4---jurunuwosetuve.pdfIn PDF document text
    • http://leguido.net/files/36778949586.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210914110029.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/52672864430.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/69958736364.pdfIn PDF document text
    • https://lordoptika.hu/files/files/vonugane.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/49793438657.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/lowopisurud.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/63abdd26c8ca1f5090a942ac2fac12f5/vuroj.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/26921728569.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16138541a617f0---23318418608.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090503194423.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/0e48273d18e5146af234d023090403bf/76875552704.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/dulisebesapuwagorovomuw.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_off0000df28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73A 19228 bytes
SHA-256: 72a0e6da39b4f616ee88055449c4d6be95f4153885027ed35605f595b194779c
font_02_sfnt_off000129df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DF 10520 bytes
SHA-256: 37a399c1719d85c2912da035c620b250fc22723367aaacdf5271d65496e65be3

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