Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b052e348dbe46be…

MALICIOUS

PDF

85.8 KB Created: 2021-09-09 15:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dadd8de982cb4ed0d5d0551aef730ead SHA-1: fec3cda1213f518e2f5f282bc8c77994d884ad1a SHA-256: 2b052e348dbe46be1ebff858d64a55347d3cc9a8454da5f19b7c4b29a545a53a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicative of a link farm used for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document's purpose is to redirect users through a network of links. No scripts were extracted, but the overall structure and URL patterns strongly suggest a malicious intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://suphammamnon.org/uploads/files/76160077328.pdf In PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/livejinisofiragasopilexib.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109050949565629.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16132605e76236---34479410800.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/bosolejulesazajudun.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/43408094428.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/46415405025.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/dezuraz.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/basp494lhamfukuf56fv4ifup2/tujefij.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/vopabiwexofabejubefidafe.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/69f4u9gegduc44i0ieisvhous6/votunesowimubowovena.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210903122908.pdfIn PDF document text
    • http://all-premium.com/user_file/files/zonubulejogemipa.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/bk4ehhe1ldb1b34g3vts6vf4fm/fevupidinusoxovobeligedap.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/59199164007.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/5728951142.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/69071462051.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/kojimodepononogi.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210904024608.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/63850238085.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/pupagikupegoligef.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/kukugakadogepanukiputoja.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/jutelitufizaxejoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=en+brazos+de+un+asesino+full+movie+downloadPDF 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_off0000de1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1E 22596 bytes
SHA-256: 6767965a5be66cc71a66a03fddfbaa7d4ffe88ca9fff47d7207ecebf744dd3e1
font_01_sfnt_off000117d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D6 10852 bytes
SHA-256: d34834ed03697924b2d05720c569347f1bcd547daf8f9f749b630dccd605027c
font_02_sfnt_off000130f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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