Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eb8ba5755f2002e…

MALICIOUS

PDF

69.1 KB Created: 2021-09-29 04:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0f10ed4314045165a135e4b807f58de4 SHA-1: 44dbca179c291f3389ae96dc460a52a6d486da2e SHA-256: 8eb8ba5755f2002ea5fd035f04b4c5bb503c52275b6bb91f4d45fd65feb2b5ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is part of a link farm designed to redirect users to malicious content. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://smidgel.ru/uplcv?utm_term=kospet+watch+faces+download PDF link annotation
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/b87bf19aa47b24c31de978fd03753750/87976784482.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/vemonisegipirimegarasi.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/zagajujuvojonejukate.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/90944471639.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/xuzinodasiz.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/fegufivix.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/83685656227.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/rowop.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/wupekon.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/nutajedokukegazimujusebo.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/xofesurezato.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/54cad1edc4d8e34db295e7cd2203bfb1/wozow.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/36185987222.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/14292713084.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/85906573535.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/51348222389.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/84591379756.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/gudiresixijosaku.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/bogivomakugoxezab.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/79232130828.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/68bc470004f37d6a8501de0a249f0ab0/85340711485.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/zonapalajebenepezubodid.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_off0000ae49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC660 10604 bytes
SHA-256: 6c0516077280b1d4b104cb4426318b7e017e4ddcc0f50a99e3462f620421c80e
font_02_sfnt_off0000dea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA8 16052 bytes
SHA-256: f094a0fa95b0d0275625f99eb8d565735c857ad8efc4506936931ef9d8b3b682

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