Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa6c37179cfbb80a…

MALICIOUS

PDF

94.0 KB Created: 2021-06-26 21:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2dae59ae40f5f3044e29b4a96b3ca2a6 SHA-1: 11d93f7fcc010223ba9dbcb6a31927d7e7a2872d SHA-256: fa6c37179cfbb80a312801cf58c9611cd65a71753a8188fa494d6986cda71eea
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs are likely part of this distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://terezmisszio.eu/files/file/93850224336.pdf In PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/nulezo.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/9c8d01e4923e5ce54dc82d460103f31c/23683221067.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6fabde0c6---fibulizatidesewunidulu.pdfIn PDF document text
    • http://446888.top/userfiles/file/2160552520.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/fijixitidugipetepa.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609781b8010a8---didenepavadorem.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5bdb32661ed3dfde756ba5db486fad24/poxoloxot.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/xabatederux.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/51sd85dhkknrkbeqgd9picr34k/sewuzaxonorivemuxevu.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/legeviki.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608329511c7fd---51797788481.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ac49d0dbb---zosigonix.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/3561021968803b5b6094ab373b6a7308/ledimurivujewularija.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160832755215ee---73959837389.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/94538096585.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94437f41f8---77912640382.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d98e821ad0---30410180373.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609670025a79b---pufibagimo.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e163f79e1b---17886333842.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/85911509738.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/55093725717.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/66565450008.pdfIn PDF document text
    • http://ciskmv.com/css/file/fulitiledipodenuwovejuli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=inevitable+meaning+and+examplePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000144d4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x144D4 21048 bytes
SHA-256: 056fbeec733cee518a76741b0b2ae70648027d47a548d8198f904f3495d1175a
font_00_sfnt_off0000e68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68B 10608 bytes
SHA-256: 02755f2d260f35fb9a8a66800539ac7b4b7b374e61fc231ae7c9644d6d671ee5
font_01_sfnt_off0000fe57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11669 17628 bytes
SHA-256: d3acf6c5db6be7140d739be89eed88e14373a0eeb1f049b14b08220754ee25db

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