Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d9eb6d7c99799ac…

MALICIOUS

PDF

79.4 KB Created: 2021-10-07 02:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: da2c3858e80c1d6a8e03a48056959848 SHA-1: a4ea0e609a8b273b67a6b342b353345697c9ebe6 SHA-256: 7d9eb6d7c99799acb436931c752ab11ac5598d6fe011bd4172113845700b1c12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/95865121913.pdf In PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/defomemebibexavud.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/8736756252.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/93606139719.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/17662088729.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1615bbea528533---logafimipafudapavejuvuno.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/litenanekivurevuxewiratov.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e16bd598cf---73485103915.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cef23d9631---57711488660.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1615e356f66677---41820985325.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/53291183907.pdfIn PDF document text
    • https://magnumattachments.com/ckfinder/userfiles/Files/zabesuri.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/98818453736.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/lenipaloxujeginas.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/dalajijeginibiwu.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/rubofinofadajod.pdfIn PDF document text
    • https://conrays.ru/f/data/71364909885.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/99798105603.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/mowodunowapevog.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/fodisixamamebifizaf.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/jepupibitelotogojo.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/838138146.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=gantt+chart+with+budget+excelPDF 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_off0000ced5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED5 10828 bytes
SHA-256: a3b3ccf315991da76da327c98c3595d0e1b2fa4635f0bbaae02a86982cb25c04
font_01_sfnt_off0000e79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAF 18560 bytes
SHA-256: d7ba87f2bf45d8e6b04c3d97ab6a5590fae414d38b4d7ba8cf67057ffac8570b

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