Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a19280d2c62f0c…

MALICIOUS

PDF

86.4 KB Created: 2021-07-22 00:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a957f8d6bafd10de3b42ffda8954fe1 SHA-1: d854320a1cd23c1f40855d51de67a8a508f9b51d SHA-256: 33a19280d2c62f0cf76b06b89515ef694954c4e8cc1d18e5a6c91da2f91de724
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of multiple embedded links and the nature of the hosting indicate a tactic to distribute malware or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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
  • 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://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f40ff1b384c---dawiwajetijowadujaj.pdf
    • http://adance0112.com/upfile/editor/file/genorox.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffe3985ef7---lobupoxogopov.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e7aa56cac6d---kesogugoneguzuxev.pdf
    • https://coolinterier.sk/upload/files/bewawevi.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/meg120s71lrvmbo548hanvlg85/57117089592.pdf
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/29074570394.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/675573343.pdf
    • https://patriciobanados.cl/upload/file/
    • http://spreewaldatelier.de/img/editor/file/sopidedoxumujusekij.pdf
    • http://kbo.pl/ckfinder/userfiles/files/foritodotidalukijiposox.pdf
    • http://mrsgladysosei.com/clients/f/fd/fd76c46f75d01f7adbe86f52c2a5b8c1/File/xudipexegobaxumuputekola.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2c11cf52---wafimuxuxogig.pdf
    • https://baoholaodong24.com/userfiles/file/rikasiwazulikuvorunexubut.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/67a8c83501b8a6d8c8b253af7b0abd5f/70085992560.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcd78c21fbd---15751314820.pdf
    • https://shellserva.nl/docs/Image/file/26454952839.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/fq104qkc18fk2jfi78d596bjo3/60901642097.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/59c7152ca2895a064325186168efe038/54296242448.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/l522fqsho2nh1r60to3ev1f424/panevipizi.pdf
    • http://thunderstar.cn/userfiles/file/20210430144611982192741.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/vso86qsuc2c9eiaq44u6t6e361/xaladosatosuf.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=inguinal+hernia+side+effects
    • 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_off0000f161.bin
ae1fd72c17c929b2d6f3e5c3b154d1dc2189376e56d1948e0cec70ec237e8ad0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF161 10684 bytes
font_01_sfnt_off00010993.bin
2247231be44d3643df51d48982d9aacffc8261e52aaf32192416d8f1a4e27535
pdf-font-stream PDF embedded font (sfnt) at offset 0x10993 16400 bytes
font_02_sfnt_off0001341e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1341E 16792 bytes