Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d197e671fd5c29…

MALICIOUS

PDF

81.2 KB Created: 2021-10-10 21:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 70901d5b4f38670b82462dbfbc498089 SHA-1: 3fe464452fea4a02733fcd0e79e5341890b1cbe4 SHA-256: 11d197e671fd5c29e41cd93ae24e61a0272b23b4a52ef08a9aa5c78dcaa53bf9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, forming a link farm. The embedded JavaScript and the nature of the links suggest an attempt to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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.
  • 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://synerhu.ru/uplcv?utm_term=good+stretches+to+do+before+working+out PDF link annotation
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/48344197639.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/5981232719.pdfIn PDF document text
    • http://a9188.com/upload_files/art_files/files/20210916_135016.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1615b3df0cdf04---jadesubifupivoziwo.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/95247502135.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/83950003024.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/dudagorajepu.pdfIn PDF document text
    • http://keitbg.com/images/files/wizexefirojugi.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/73459748407.pdfIn PDF document text
    • http://fourfoods.com/images/files/gekanomage.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ed625b6463---toliwiveboxemuvodowit.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20211004024536_neg7yx.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/b73adb174eff91a0598dc9e8066a8890/59450937784.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/fijogamidozupagir.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/xodurusemezukibi.pdfIn PDF document text
    • http://hainfelderteich.at/38905280427.pdfIn PDF document text
    • http://nemochem.cn/upload/files/8416584136.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/19496240082.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/novisitijan.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/vofekososaze.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/b33754b33fbadfa5a2f7f8a7f53c23ab/xubikikaridodemawak.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/jupufuweliwenonukod.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/sigumidaxi.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/jugutemojemijag.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_off0000d895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD895 11004 bytes
SHA-256: 22d5f96e572e5be6c46cab5c3d15c0db95be788b52f26ae4c76f497eda1fd942
font_01_sfnt_off0000f204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A16 17312 bytes
SHA-256: d9a90135fb5ec58136679787077c2e5b1d2148e9506c83ce28c233678226f7a6

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