Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee1753999435bf4…

MALICIOUS

PDF

107.1 KB Created: 2021-08-24 03:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ac1b7a7b6a51dda4d36054e6080e0391 SHA-1: b445845af6593635af4e4b4847bed735fc90998e SHA-256: aee1753999435bf478950cb8bdcacd8fda06aac298f9f42d9916e41f5ec3a5c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely serve as a distribution mechanism for phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

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://allytemp.ru/uplcv?utm_term=down+the+high+society PDF link annotation
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dba81515bb2---jovogiwuvesosopufejatu.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/ac348634a835eb805c396ffbd2f6ae80/komesefajeditovedusawij.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160efd49b8c93f---90685801111.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/fefute.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/c0eb61b9e4b42828d7859647d573f373/zalebibav.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0ac77ee01---84129557701.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160876afa1a005---44687312417.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/jomadoxonatopotutofumulug.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16094d6e129986---96368021521.pdfIn PDF document text
    • http://msiutilities.biz/documents/4953802705.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///70432455661.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608475a710054---bimowogaxigozaranovigele.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749f58bfeb5---sexunipetumedebojujobumux.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/3cp8oaj5s7r5qb32bo8djfspm9/fawibafukosikej.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ac9aa2a3e---86565711208.pdfIn PDF document text
    • http://bearcatbb.com/CKEdit/upload/files/dowizezamonoxur.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/p0iqjoftinbi27d44fkvjiu3o7/fofitizotak.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19bf5d985a---99081840460.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1017c231c7---58088476263.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/majisosofixuruw.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/81466576900.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/98841330092.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vegagijewobeko.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b5aadc421---sepopesojuravakijaj.pdfIn PDF document text
    • https://magatek.com/documents/file/wofujox.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/gatusiwumenajanale.pdfIn PDF document text
    • 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_off000141fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A10 17272 bytes
SHA-256: 5908c153862f405c3c75354e2c629ed59123bb0369464c4d6437909f37eb9aec
font_02_sfnt_off000185f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185F0 10404 bytes
SHA-256: a1f7a3bd4d6d50b62ab19f3e4f29d69d98e255ac7046e907d17f74ac16d5dd90