Malicious PDF — malware analysis report

Static analysis result for SHA-256 454f40050befd9d5…

MALICIOUS

PDF

115.5 KB Created: 2021-06-30 02:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 032f91e909c462eef925a2f2ef660c12 SHA-1: 595a205d565304b046d3223e0d9f6221f79732c2 SHA-256: 454f40050befd9d50241e23ef29b0e58e2cc126aec6193196c908a4fa88510db
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress upload directories, indicating an attempt to host and distribute malicious files. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The primary attack pattern involves directing users to these compromised sites, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1a2624c49---79816546183.pdf In PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/tu3fp7tm3qdaetoe0a5h395gf8/movumaperaxexabunaziv.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a58b4ac464c---miripelis.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/uiptcedcfo173rjbdf72arvl3h/66009705124.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/3345559367.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/p5ojqio4mml1m1vrb1np7sc3a7/70316736266.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b6391685cb3---ludojidonasi.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/668a132f5d6f193474ec6ac24ccc22cd/zepuradoruxilekibivuj.pdfIn PDF document text
    • http://kiemtoanhaiphong.vn/upload/files/94414303472.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b007d28be26---fejikijorizawulis.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/71196229189.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/19dc0048200b83331a7c88b33254ce20/19031372203.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160897c025c9a1---92845839518.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/iu1tr765sgigg133k692agk8ke/zofexolegalusunejared.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/gesilaxuvodemene.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a256db31f---wobenodibevatinek.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b01d8c6977---vadelukise.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/rojugefijusosoz.pdfIn PDF document text
    • https://campermagazine.tv/public/file/tukuvalowawemetimunu.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/15746dad3d91a8074278e94f05d80b23/xonojivelevepolanoraxulu.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/98b79ef24f75063968b95554705bc460/430956560.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2505b5489---25467488266.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/zunala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=i+assure+you+meaningPDF 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_off00016319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16319 17616 bytes
SHA-256: 07bca1a12fa6aa1acb044e48c604912d6873e1f9f2314ede07b3bc9535003414
font_01_sfnt_off0001916d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1916D 10472 bytes
SHA-256: cfa276d23c19fcfe5ed5bf0ea90ca9f81d9e38181c5a76a5d350c0569cece4d8
font_02_sfnt_off0001a936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A936 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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