Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b03cf005b5e331…

MALICIOUS

PDF

57.4 KB Created: 2021-05-23 18:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23523c8871161cb7e873152e02d271b7 SHA-1: 71cc54d9683ac0b3ce826743d3ece379f0b27f3f SHA-256: c4b03cf005b5e33125c64db8bd7a17cb135b79e7008b8180c3c56936738823a2
154 Risk Score

Malware Insights

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

The PDF file contains numerous links to compromised websites, suggesting it is part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links point towards an attempt to exploit user curiosity for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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=gift+code+dynasty+heroes+legend+of+samkok+terbaru
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a364b6d7ed0---12097152793.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/magorunefatikatabesuxa.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/2eb027bdc00ff01b1675f7974ce8b9ee/85659805711.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02503ac105---samuxedugotowejobow.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607532b43e79d---mijox.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1dffc04fd---jufupo.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/949b262686dd131cb97069ade1524ea6/58980499242.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093a7b7c0939---gidalojej.pdf
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701f4ec68c9---72004760882.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/pe39p5t4n42nvqpntd7bi3vka0/12609534492.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/98d8337310d2abb46cf274bc5f822c90/47487379642.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c753bc45a3---23147296072.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71f09b6cc9---xelemisujalapakilav.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/g0mk34ik3i26mtkva3h580sg92/87778622821.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b78e74175---luzilotodifolowad.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/91101b739e51196e865a702b13227c81/57800999608.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c52f4fcd7---8053182932.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/jfr42kdk761bunso2dsbv1rq8k/37628591545.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1c2.bin
a5cf527e649c8d5e4052246d853f0ba3dfffa92457bb212b3b81ba593c231592		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C2 5772 bytes

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