Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33bc8a41297a6ae…

MALICIOUS

PDF

84.0 KB Created: 2021-09-02 07:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: e7547cb1d717ff2373f4b3f562c00b20 SHA-1: c6c5c9e4ecedcded8c37f95884ac01ccc8af701b SHA-256: c33bc8a41297a6ae6669b11d1b8a054f4d61edc45956a4ebf03506f509aa758d
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/a342a795fdcc9b1ce7a8c1e20f6f1232/fepokuxulubulo.pdf In PDF document text
    • http://www.motionmantra.com/userfiles/files/97329263853.pdfIn PDF document text
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/37082964583.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d327e2d90e---wazijogupatutusowovibi.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfe603539ae---86136301585.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/sevatoremakosinozapiku.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210701_020013_2158.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f5d6e7802---kegadam.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/muverozanojefojisob.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/pijesowexekunowox.pdfIn PDF document text
    • https://ecoretras.com/file/masukulexoxugamupuradavav.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/5e7996a757eaf175a4ab5c1eeeeffa7c/3555673019.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/zusugenikesapa.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/079871d1050b030d0bd072f5a88b7403/pepapodomapofajeso.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/jpt9l6m3eu0kmrp9t3ohghsbcj/53783230083.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1b95007a4---kejarogezuperetesisaduta.pdfIn PDF document text
    • http://lelit.nl/app/webroot/files/userfiles/files/8778695456.pdfIn PDF document text
    • http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/17105966047.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cc8fd4d45fad8c9dbf6ef34f2aa365ad/badeguluro.pdfIn PDF document text
    • http://juhaszautovill.hu/userfiles/file/nojiruda.pdfIn PDF document text
    • https://agermag.ro/mm/file/76600546702.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/vulolugaba.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/dakiranen.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///45051756525.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/zatuwumajirulusek.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/maxuwupibowama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=real+english+book+class+5+solutionsPDF 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_off0000dbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE8 20208 bytes
SHA-256: 466375aa92b8831967660a73e0d3d2c788f18f39b05dcbc881866788f9196413
font_01_sfnt_off00011092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11092 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A9 10920 bytes
SHA-256: a087fbf828d76fdf4dd4dbe18aa8c8fd121f3111ad811f1c2f9a8dc4e59407f3