Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b590b4431829605…

MALICIOUS

PDF

90.6 KB Created: 2021-08-22 02:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d312e8d6d8f625424a7c7f35d5087c56 SHA-1: b2d41599256a5d290c1f15cf98bd0b57d520be3e SHA-256: 2b590b443182960552b5c40eb00053741e08eb9cab5051a49d8f024aa5311763
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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=quadratic+equation+word+problems+worksheet+kuta PDF link annotation
    • http://tlumacz-lipno.pl/pdrzewiecki/files/6962761801.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/gozujudogifazibupojakanep.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/8566609840.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb7c2956fd---14082987225.pdfIn PDF document text
    • http://usagimatur.com/files/others/39453616097.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/xokimujakopujo.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/30d0da64bfa451dac9b3f63779b938bd/96064558689.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/vabotaxefagepovujo.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/zalizegajaxarogaxefimem.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cc3cc6c0a---feranugepo.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/fcesscuj75l88k2579g1fdab52/68918475593.pdfIn PDF document text
    • http://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/fabike.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/febuwejopev.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610474eb04428---pajol.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/3tgn5ae87lgmpsht4nkkg4mnu7/24902103823.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/fuvevunidor.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/68030662363.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/47675556954.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607265c7e4ea7---warupujipakerakomotaxuri.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/eee1b206305703a2a2a263d5732a5c54/55313436054.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7be9d79ef---silexidebe.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/47941226927.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_off0000f82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82D 18104 bytes
SHA-256: aa6a9955779daca949fbfcc71ac179f4bc6513c7d6d61058abd1aa897aa1d38c
font_01_sfnt_off00012865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12865 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001407c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1407C 11404 bytes
SHA-256: 845c9e40ef8964df46bc927d80ebe0bab777cae6ceae39eec56e005d82515af5

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