Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa2800ef08e5eea…

MALICIOUS

PDF

82.7 KB Created: 2021-09-09 20:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 387268af77e656cf0386b4fbe6853dcc SHA-1: d3ed47e72c52c225e9c4199c87d965c5d5e46f99 SHA-256: 9fa2800ef08e5eeac7b2d5db349e7c2eb7aac6795a8521c03f57114555b8745a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. The document contains a link farm pointing to numerous compromised websites, likely intended to redirect users to malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this is a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ibericadearmerias.com/file/bosuxakegiv.pdf In PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/68368980692.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/trsvmda1g3src64qkm2fe07mo5/makirutaxebuduzuvetil.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/sogowamukuwozuvudefa.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c2869266a---63816161329.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/zunimobezavefewiriwan.pdfIn PDF document text
    • http://imoroz.by/upload/file/82310482332.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/9baabec6410873f037bbfb3bb444ffa8/zesopiwomubu.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210906063428780.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109050542072697.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/98533710361.pdfIn PDF document text
    • http://upakuika.com/img/file/pupijaj.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/gezegemiz.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/rujezubuv.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/k6cqdd9t0or2mrul8jqc3vthhu/nomonuxarapipazataje.pdfIn PDF document text
    • http://hopkim.vn/upload/files/korepokepawesototurar.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/bevamugafadizevorowi.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/41067670676.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/20359050342.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/84455667800.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///burev.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/60065268537.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/39011050445.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=distinguish+between+eukaryotes+and+prokaryotesPDF 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_off0000dca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA5 11160 bytes
SHA-256: a90a9e1aaea89f08b34b75c61302334f28befc0b94448f4d4cd8c33eb01c193b
font_01_sfnt_off0000f65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65F 17848 bytes
SHA-256: 0064d113906ee4a62d1fc325184bf37c2b44716cd0f2f45ff3fcc62defc21ec2
font_02_sfnt_off000124be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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