Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4712529ac760a96…

MALICIOUS

PDF

96.9 KB Created: 2021-09-01 02:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0c0408ceabee50308238ef3665597eb6 SHA-1: 1c1c0e6b6bfd7d642f46e02f53b2923d91822c09 SHA-256: d4712529ac760a967b9a189ad22232197c1b7ba61c226a418cbc3c37373596fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs pointing to compromised WordPress uploads and disposable hosting, suggesting it functions as a link farm to distribute phishing or malware. The presence of external URI links and link farm indicators strongly implies an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://nomylo.ru/uplcv?utm_term=traditional+bone+mouth+shar+pei+for+sale PDF link annotation
    • https://mzlpro.com/web/img/podborky/files/4752453276.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/4f91192fda010df78fe6c25dbd125400/62593059972.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57428adf5a---66220950804.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/81427919111.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/zusojifapekawowu.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/86937167861.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/47325500225.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/fipamoponupape.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/45203180516.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dokaxutabaxolove.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfe57e11ef---vepogikowixodapigix.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c25db6bf55---45177991959.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/e49dc7e1cdae9c1578b1bc211f8d68c6/pezegaguwevorobezefetofal.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/47775993405.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/matubi.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/rojowikefinemoxumupu.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/zavevoxalavepis.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/e494886724967856a11157c619caa941/93856451006.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/23121155823.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/94957815134.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210718_3544325E87B00D9D.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/23049710055.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/tadulajux.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/zuminidujo.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7046daab82---pitebilepixelotinose.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/0acdf3c97f78bd999216411f5b0eb46c/wugagapi.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_off000113d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D7 18468 bytes
SHA-256: f39ae455ef1dd622cc266e717343a7bcf154c6c4d9ce5f01162ee16182838ca2
font_01_sfnt_off000143d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D7 10964 bytes
SHA-256: 17fe06f759868b54f70bbb77b31e9144a1ca2ed5ab3c289ebdf0399008c78924
font_02_sfnt_off00015cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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