Malicious PDF — malware analysis report

Static analysis result for SHA-256 869d3bd9eb43fe2d…

MALICIOUS

PDF

80.7 KB Created: 2021-09-03 18:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2c4aaffcf6d469299e95525d50a42492 SHA-1: d967e8ecb83dbf50cd22b3ceec3dc1cd732896f5 SHA-256: 869d3bd9eb43fe2d648c5a33f4c90db555bb05160e08018a5fe8922e0a1d0a01
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The file's structure and embedded URLs are consistent with a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/124f5c944883148e3aa8780026d59a4f/92947123534.pdf In PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vosalatus.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/tujexusinimarelarexuz.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/33336721876.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c28fd4b7b0---buviroguludesasiwogugenod.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/683eed3bdf017c498b84d9ed7acefdf4/bexuzerexoloramoxaporale.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/bce07dfe7a559dd41bc0eb56260496f9/xuvonetanewivowabijazib.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/28701200370.pdfIn PDF document text
    • http://odumakus.com/uploads/files/71096933799.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5c9f17bcf---69335095030.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/65454316950.pdfIn PDF document text
    • http://krugernilssonreunion.org/clients/c/c3/c301050bdfa85653d7453904791897ac/File/najoxigep.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160733b119a790---kiwab.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/1153743187.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/63588189310.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c159eb1c129---rusazetedurukowudego.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/85191027805.pdfIn PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/rokakebonurepemaloxe.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e5e071f35446c75dd60e75918f71bfc7/58138299875.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/rakuzenonobabepobe.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/pozukazu.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210815_44DF208475123BFF.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c10c5dded1b---11194170213.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/22453813033.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/69484960487.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=plotting+straight+line+graphs+worksheet+with+answers+tesPDF 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_off0000d92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92C 10708 bytes
SHA-256: e8f09e3b291ea29586800bce08621ad47b652b002de386bc6b609be0ac3bbbeb
font_01_sfnt_off0000f1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DD 16636 bytes
SHA-256: 50250a0c64c5b73d3f058c887b12025a516c0e8baee8effc8dc91aa8f5123367

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