Malicious PDF — malware analysis report

Static analysis result for SHA-256 4710c08359281873…

MALICIOUS

PDF

77.4 KB Created: 2021-08-15 14:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e4d31503f4acb64fab35f4d6ba04e1d6 SHA-1: 773202204a933df8ae84ec20f99624bbdee6723a SHA-256: 4710c083592818738aecc2f60c93f2a457232b0fd047f919e08dde761634244b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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://forter.vn/hinhanh/file/rinod.pdf In PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160764e6142841---96613138076.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/cfe70016ebf297373386ac368fa082d5/galajiwupanoriluwo.pdfIn PDF document text
    • http://phs1961.com/clients/2/29/29da8dc1278d8f1c58a3d16208bcb4e7/File/vagax.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085277072949---6015219337.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/54984ea1a0d0acb5c94259564b83f091/4551180548.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/lidodarug.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///kaxos.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/85885616070.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/12799229913.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105201011338756.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/gawijawuguxijutegugawaju.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a714718ca21---54810422595.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/76217466721.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/napefosasogakexizijepex.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b726263e7f1---47983456563.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/muzusiladamujivubuvu.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/5be1a8f29149641fa432b5237206d7f9/mipel.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/82176099.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860521d1c4b---52170064185.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/fewasitejuzaf.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b34fd29e482---54557140832.pdfIn PDF document text
    • http://kd-council.com/upfile/files/12607984205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=que+significa+so%C3%B1ar+con+una+vibora+amarilla+y+negraPDF 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_off0000c627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC627 17308 bytes
SHA-256: f7456bc032a576e3fdbce0dbe0c5870d1173ce6cc62268be509994bcaeec9ffe
font_01_sfnt_off0000f1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CF 11268 bytes
SHA-256: 1b0dd7d10d3ddc1eb8997426fd984dddf1afd5778914f98a41a093db0ac3d997

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