Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e9159f56a3cc691…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 20:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7429e508d339bf2ee50e45c9b802fb3d SHA-1: 7a140f996c7cdf776e178bf92a3a7429d5166766 SHA-256: 3e9159f56a3cc691ce9f3fe463b6e4310e22284eeb0c593e6114d2f603b1e567
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains a link farm pointing to multiple domains, some of which are identified as compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content. The presence of a visual download button further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zegaoyun.com/calisma2/files/uploads/95633273624.pdf In PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/kusuzutufojelakusakowo.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/50185491289.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/62436184517.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/30161169006.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/81159027674.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bacd835b73---begeperisa.pdfIn PDF document text
    • http://darstin.com/userfiles/files/piwemodubunutinebobitew.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/rivuxugusajimugamovenuri.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/wufexitizexuzumo.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/95824251323.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/84442565367.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/galudopojilupukok.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134925e6cc49---70844091555.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614529df224d3---meludowukasuluxibod.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/duxugenoguxowululojoriled.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/vipomibagazudabufizusaku.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/rodanojumodoxokurekatabe.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/1338344124.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/16003540393.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/mogexaxefa.pdfIn PDF document text
    • http://pactolous.hu/upload/file/46446923536.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/0nj01orqhs2440cju2td2h4egb/80025641834.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/46375578022.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/weralumusorimevenagar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=igo+para+android+downloadPDF 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_off0000d6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D6 20516 bytes
SHA-256: 69c90e63b31c1657aa39ab3be6d4d87d7f8560bb391299299a52d39b044e9a7a
font_01_sfnt_off00010cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD8 10204 bytes
SHA-256: ec1983da57cc2d90b9ab34b822d5c2e48f9b43b0463b3618c8ca6bf77c9e55a7
font_02_sfnt_off00012398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12398 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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