Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa59ccad6b071204…

MALICIOUS

PDF

71.1 KB Created: 2021-09-13 11:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d05e48e7e8bb19c72bc9b6a0f553a1ef SHA-1: 9aa87115351c0c7c7143b45a2a2782e4c91a8810 SHA-256: aa59ccad6b071204258647f96b09f44e2104a935c8adab95c2078b487787990b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, several of which are hosted on compromised WordPress installations or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to external sites via malicious links embedded within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd8a6902ad---pekudogejirigemipumereguk.pdf In PDF document text
    • http://ranfeng.com/userfiles/file/2021-9///202195217567853.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/41222764956.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/mikulozozowijuz.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/51650991961.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/torumufexe.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/teloxopomavavix.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/dugijodozanuxuz.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b96e1af075---tonapimusetedekivepilewu.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/23533408087.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/5988961056.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/xibozevolofujomewugotoguk.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f554f7c0e5---74556063470.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/zaraxeradafinukixeboxir.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/6908626637.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/45522870354.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/49519809298.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/kozenawapob.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/bofabemagopaninow.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210904000730.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/99219946707.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/rejewesifapi.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/ralezoxuvewoliwipakew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=bioecological+theory+definitionPDF 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_off0000b712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB712 15584 bytes
SHA-256: 2013622c1b21650dfeabcccf7122e1de491f04abef99c0b166c21684239677e3
font_01_sfnt_off0000de96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE96 10752 bytes
SHA-256: 5fc5a6262bd64d4d4e4065b822e99876766598fd5727af8fdd5ac1c1504c1f04
font_02_sfnt_off0000f71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1