Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad5f7b2883e8bd69…

MALICIOUS

PDF

76.5 KB Created: 2021-09-18 05:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 37edde102726d9d207a260241fae778e SHA-1: 47eeab6e810bdec1bc7b9b1892822c413e02e56e SHA-256: ad5f7b2883e8bd69e0ec70ff4f71e313aa644df8a31a49305adec06ad59a11e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute malicious content. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=big+head+basketball+championship+unblocked PDF link annotation
    • http://dytac.hk/userfiles/95183945540.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/buwipaxesuxulav.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/11618019092.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/fuzijalo.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/64999680312.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/2uqli76mhk44m3iitedts9fr34/kazaxonowugumuku.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373b148ab56---wupab.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/katexijowelapimod.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/16684722219.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/lezijatuxinorakevizovukan.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/wujat.pdfIn PDF document text
    • http://tjtvina.com/Upload/files/luxemeviruxu.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///35890179831.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/nodobowixawujiro.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/mubonelupu.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/90820560587.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16139ae240f2c4---60663062368.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/87492229007.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/jixenugululasegabuvuvikuk.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/vanofawuji.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/89953155473.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/virob.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/7tvsvotffjh97uqorgad76jl54/57324643045.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/98322243089.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/fepimorel.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/gotipekelosug.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021091522173973499.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_off0000c5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AB 11248 bytes
SHA-256: 6bfb34cc0f5fa2a258d05cd9cb04af4c3b03b04e844f84d891d54518aa5a5bc4
font_01_sfnt_off0000df7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78E 17112 bytes
SHA-256: 2016063a24fae5742042884db5c35347fffc53c8419bbd6390cefba23ee7b9cc

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