Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecffe725442b5288…

MALICIOUS

PDF

82.1 KB Created: 2021-09-19 23:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6f29185ca6842e4f58823b1140e768f7 SHA-1: 30aab086922b4486eee566607a6efa368e76a4b6 SHA-256: ecffe725442b528803d1c20842794079fe1dcca1e0bce57fc3a6c692e7da4b26
172 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=smule+vip+apk+2021 PDF link annotation
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/870052400.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/wodoxaboxukenenekuzifu.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/26914431213.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/30242665478.pdfIn PDF document text
    • http://uchid.com/uploads/file/loropebawokanukolubezezij.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16135b4aecf124---66409959705.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f8044cdbb---52625860928.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f161734fa---wuzatemosavolab.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/34436453568.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/70090586285.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/pudowofegekixewusime.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210914/16315784339112.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/88310564674.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/wajefuduzetutafojarimazo.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/petomo.pdfIn PDF document text
    • http://pk.mo/userfiles/file/67382281940.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/55951681358.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210906_160648.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/21798676088.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/32424957939.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/jipeweramitilowavudubo.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/491e7b5b206bbd8ccaeedafcdd1fd7b5/xeribejajofat.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_off0000d920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD920 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF132 19052 bytes
SHA-256: 84d4b1de6d9e58a5e048c5c98143f8e96e8350db28fd93910308b347f2b18252
font_02_sfnt_off0001231b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231B 10448 bytes
SHA-256: 8b4af2b28a9e07a222f32f832b6bc2716fbdf374d937591fa9a68afce57fbf55

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