Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23306cdb1453177…

MALICIOUS

PDF

73.5 KB Created: 2021-08-18 14:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: de4f7d95146440846e9172149c5bd685 SHA-1: d4233f484add126f281564b199fb26267e2b745b SHA-256: c23306cdb1453177e7b6fa84ae48c851b697fe27725be98fbc3f450006eb3101
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. ClamAV and ML classifiers identified this file as malicious, specifically as a phishing trojan. The presence of multiple external URIs and a link farm structure indicates a likely attempt to lure users to malicious websites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=skyworth+android+tv+43+inch+review PDF link annotation
    • https://triangle-electronics.com/assets/userfiles/file/53783848075.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/zikorewiwanenapirisere.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/bulubiwepubob.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160802cc902971---fibonodovula.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3a4eedcdc---mamevakeluwaruv.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b755502f16d---60748218994.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b6ff218a53223705a3e41e6cb8779892/49805827762.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/19621947515.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/79943152355.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021080818431897.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/7jrskj5u313hfj44o8fq9plf4v/pejulizumu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/0f789f6ad96458d42e98e5e3fcb32a89/29380964769.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abca3889f3f---luluzuponozedexukaxeximi.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160828b4da43ee---wefusafavatupab.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/is5nlafukb90ok4081uhk34kqn/24797824675.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16077b7b1a5f27---nezivi.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/gigevonomupiriwatime.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/f8df8012c5ab335acd70db70f4b6e2fe/42241989708.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/fexageme.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/p6aie8pvt3mja0o4hprcehtf02/14093434148.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/jexerot.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160772768ea19f---60688426082.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/roxegimovegojusajaguvagef.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_off0000ba4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA4F 16564 bytes
SHA-256: ffb99c13fd11f05c4875c4a08e5189fff79d489287a96c4108e1fdfb2acc5f27
font_01_sfnt_off0000e52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD45 10936 bytes
SHA-256: e74796fe180af08e0ddab1747bd2982c19ec20e3cade29f47a3e3e8bddcfc8e0

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