Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ea72f3ad12bc9a…

MALICIOUS

PDF

93.6 KB Created: 2021-09-23 15:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 228171be1190aa25b159bab7fd2a5062 SHA-1: 6edf41582f485096f6945528a86dd6385bd524cd SHA-256: a1ea72f3ad12bc9abb35b85039180db633284fb9f46f78369aa0a69a59a64b0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to manipulate search engine results or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://hawaii-resort.info/images/blog/file/53256041905.pdf In PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161439c9fbb34e---24528554623.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/bosevudiwonavogoboki.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/ca9dca8131f6f666638d93ac738a01b3/niwadivuvanipepujesim.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/25429246455.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/waxurisimobukef.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/nosutefavivu.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f31c9d2b83---24143578144.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/farexirik.pdfIn PDF document text
    • http://tochalco.com/uploads/files/21034872013.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/2603885207.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/sijeduzelujevevowolokor.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/namexapagasajiregikove.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/fanazatizowarenoxadejusuj.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/gevijerijezon.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/bagiwofajajo.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/71842231578.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/kesem.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/34300332446.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/xareragetoguxoromalus.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/58702870325.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/naxapaxivizulijiwopixawi.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/lujuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=java+spring+frameworkPDF 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_off00010943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10943 10792 bytes
SHA-256: 4b1f0dc7ffe1b147e1b9691870c07d4e17afc8171f668cd9e2b16382592dda3d
font_01_sfnt_off0001222c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222C 17600 bytes
SHA-256: 6bccebaff4fa748e16f14b3a42361ec1eddf927f3ddd3129fdd118642805411d
font_02_sfnt_off00014f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1