Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6aebe703b60e4e9…

MALICIOUS

PDF

99.1 KB Created: 2021-08-02 01:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1216369e14d28d49daa3b37148aff0fc SHA-1: 62ac503cfc8a830c97f11eaa55ef1a54b690cf9f SHA-256: d6aebe703b60e4e9494711d573a01d2950ce2c93953faf2223e83b711631b648
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, including one with an IP address literal, suggesting an attempt to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URI heuristics point towards a social engineering attack to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://zdravi-kromeriz.cz/files/file/wujivaguvenidulovofafuzo.pdf In PDF document text
    • https://digicpictures.com/downloads/wodemeperunuwofefobipanom.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607954fcac31b---wolelebuzobo.pdfPDF link annotation
    • https://spacio.hk/attachment/file/nisisedilape.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/51b9751b18df45b3a16e1b2eb95f1058/37607298983.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b108f9095d6---52830805356.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/7cb3551ba4ef915178780e0a03fff8b0/nulubupemuwiverapebupilu.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cad88dcc8e4---sokigokatifemoxarebozev.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7fa4ebe0b---35525612977.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/88922046839.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/fec8e04e42a59c2ed3db2671f24482c6/59439853300.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073cb82bfe46---xulitej.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa65e6462bf---72295530518.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/bojive.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/kijunezepevemasijej.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/wonopunoduxamuvara.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/4molvs970p75fuspiqoasuaple/waviriwijovixinunu.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/pazazovagatogod.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/zekojamovinaronejaga.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/v7g6i75h38jqknrd2i8i5999e4/37748933258.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8843cb6fe6---bedarunevebaseligebaruri.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/8bbedf7ae2629898cf634a1b4d7955ed/93916407731.pdfIn PDF document text
    • https://0900107678.com/upload/file/90207323729.pdfIn PDF document text
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/kofekogibupabuxofedirede.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/g7doaelgo81fcdgvqbebr349p2/natipulife.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce739dbc5c---99014861594.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=bangalore+metro+phase+2+detailed+project+reportPDF 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_off00011cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000134dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134DC 11264 bytes
SHA-256: 1d20de147f2ff119be2c2bd82b2a1e72b75969bff7a2a157a1fdc6fa1eb21974
font_02_sfnt_off00014eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EEF 17900 bytes
SHA-256: 5eb2bd5fcba96db64313d00065020780e00a43bc097f39a1641b6ce13b7f4ad6

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