Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e733b9a8de877b1…

MALICIOUS

PDF

82.7 KB Created: 2021-09-24 06:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 89422be7a88a9cadcf96ea88a9dc3052 SHA-1: 6c2f8d9b2f212a05acadc32d272a58bc46812c68 SHA-256: 9e733b9a8de877b19e3ab7ce2673eb232d3045c8b13cd1ab3d15125cdfe9f028
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://biographiewerkstatt-singer.de/userfiles/file/37824579006.pdf In PDF document text
    • https://imaggu.com/ci/userfiles/files/72793407080.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137957399d8c---19096937578.pdfIn PDF document text
    • http://rhondachem.com/d/files/54247168372.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/zojinupiroxad.pdfIn PDF document text
    • http://precisao.org/files/files/tajunonizujina.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/69637692693.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/8675616257.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ebb3d5968667372c27180c2653bfbe5e/kudanorerus.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/bekoroz.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/lakopuvekes.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/damogigipovig.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/c0e6767db8fa46aedb23882800b5c6ac/rakovuxidafagavubofa.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/suninosibebiveb.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/85995974516.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/32614134693.pdfIn PDF document text
    • https://exclusivelimoservice.com/ckfinder/userfiles/files/seganujenip.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/dokumapap.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/totajiw.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/jukomivelifeloxinar.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/faketumido.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/mikevoretexemifutasek.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/61649473113.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/4346078375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=rfs+game+free+downloadPDF 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_off0000de4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4D 17880 bytes
SHA-256: 3d5d7d182b2f7c5b1d88069ffbe4e23b11f99d7a28c734ceae00fd5dfcc6a67c
font_01_sfnt_off00010d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D11 10636 bytes
SHA-256: 3016d22433621ba9c11443983244caf57c012a62b24f1422e15b24b0ac269f52
font_02_sfnt_off00012543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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