Malicious PDF — malware analysis report

Static analysis result for SHA-256 15682d3bcf024f9c…

MALICIOUS

PDF

88.0 KB Created: 2021-09-23 14:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf45c14e27cca65a9375fae14fe0ab47 SHA-1: 9676d2d171083c8c52ff6d25c6d6bde95fd1830f SHA-256: 15682d3bcf024f9ca9cf460bac61dbccffa51bc875ad6893e5fc75e55762f75e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as an advance-fee scam lure, containing numerous links to potentially compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body was heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://smidgel.ru/uplcv?utm_term=how+do+you+root+a+android+phone
    • https://mertlakustika.cz/images/pages/file/rajen.pdf
    • http://blekinge.boj.se/uploads/userfiles/files/romakexetagexazinuvo.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c45159fb7---27891341305.pdf
    • http://zzfcw.com/file/fkimg/file/14517374692.pdf
    • https://www.ocnistudio.cz/ckfinder/userfiles/files/53622553160.pdf
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/xuzipuri.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/rjq0d3oc9o3t58plm7h7e4b36b/kexij.pdf
    • http://drapa-technika.cz/UserFiles/File/77009217549.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400ded09b1f---10150517095.pdf
    • https://sealordhotels.com/ckfinder/userfiles/files/55630857311.pdf
    • https://cheeselicious.net/UserFiles/file/tizudipusasigafumukiza.pdf
    • http://firmen-bekleidung.at/userfiles/file/35414138556.pdf
    • https://phuketwebstudio.com/ckfinder/userfiles/files/24218274768.pdf
    • http://www.enredmail.com/templates/files/idCliente_/file/29145100884.pdf
    • http://puzynowska-kancelaria.com/userfiles/file/jexolodebudajozonola.pdf
    • https://butyfarm.mm520.net/userfiles/files/11874501967.pdf
    • http://slkuang.com/v15/Upload/file/20219132136302297.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/6k5lr4nou4ovn8kmd81ng8crvn/vuwekox.pdf
    • http://dental-forum.ru/userfiles/file/78416108735.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/c648cc2d0b6d9b82869220887d84fda7/3170212379.pdf
    • https://taperagi.com/contents/files/posigabubisodo.pdf
    • https://euinsuti.ro/app/webroot/files/userfiles/files/mepalagaribiwewuwa.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_off0000f179.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF179 16792 bytes
font_01_sfnt_off00010990.bin
3c161a0c7bf8661cbae51099c17a20a1010322dfffd99ef225de265328bb4c8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10990 10568 bytes
font_02_sfnt_off00012194.bin
4c204f87c1d31616d2d0ae13d9be957d681d19368dfdaf344e87f22a59ebb42e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12194 18588 bytes