Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18509114e2aa277…

MALICIOUS

PDF

84.0 KB Created: 2021-09-07 04:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 77cb22625d69c37c9e7d99986cc371fa SHA-1: 0b7763afdd51951e2734badc5d2f0992a58bd11b SHA-256: a18509114e2aa277228284fde47688c787ed43acdb5cea4420101cf01fdca408
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/ks13o078ad9gtaol22uv39ood1/95158308296.pdf In PDF document text
    • https://artinterior.bg/userfiles/file/zutikix.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/fifove.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160fb3bd7057b8---zibasanewowagi.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/9852309180.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/veronob.pdfIn PDF document text
    • http://carbonelite.ru/file/97005669006.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/3a1f47ec2bf4f61c15e6b33aee836785/mikapububutobaf.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/luql1hqa6d1hi9l3kl8g3vtph4/relatexesutuzile.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/fonuvuzitozadezanizotin.pdfIn PDF document text
    • https://j26clean.com/upload/files/97758652994.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/2a8f8537561da9ca91c76f5c00add09d/31169798326.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c390752fa2d---gemovurudena.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/19124253560.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c21034d2a9---30544655151.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/dac3aad21d42622b38c334cf398612ea/negasovule.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210603142034.pdfIn PDF document text
    • http://rsst77.ru/upload/files/65854889777.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/26218766347.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc796c9287---jewuzexejutukuxit.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/31b567a22e35c94cfb15729e89a87d16/11405554314.pdfIn PDF document text
    • http://freeski.hu/freeski/file/64885524119.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076111f405e0---81211434811.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/topepijuwoz.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/xutalodebutusutadixe.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/25820059863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=sistema+nervoso+periferico+pdfPDF 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_off0000dfb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB1 10876 bytes
SHA-256: 589ffd866f7eed5c94c012c1d08ed602654c157093e6d3fc0037ad6c1b40a5ac
font_01_sfnt_off0000f8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E4 19484 bytes
SHA-256: 5f75c963fd383f2550bf4adabc4b18bd1c9f3d7309d0e18a290e61396e8c840d