Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5470b19565aec0…

MALICIOUS

PDF

77.3 KB Created: 2021-09-07 07:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b35d5e8705543844eb7c55f7c93b9eec SHA-1: 8bc07665965d1b343f3c68704c5946f42774b94c SHA-256: ef5470b19565aec0ceee881c219f24c8bafc2637648e0050d34e610b85bbfb87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://medvor.ru/uplcv?utm_term=cover+letter+for+job+application+pdf PDF link annotation
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897a4ed7e27---67904376082.pdfIn PDF document text
    • http://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/58985095329.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609243114737e---15316703329.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/pajufewotoxidu.pdfIn PDF document text
    • https://termoformat.md/img/files/vafixapojuwepi.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5475b5d63---88149585295.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/8l12f57rse2jc8c63fteajfolm/46720741611.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/fisigo.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/81153436692.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/kapuxinusabejokumute.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160e518c4b1704---vedatodugebawuvom.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/fokowubavutudabudobamora.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/60311500578.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/5744997000.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160801faab76a9---47967092581.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/jakexijadi.pdfIn PDF document text
    • http://russia-ex.com/images/blog//file/83367586106.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/6a75a44b307e4028b51c960fd26b6285/dugosadipaxumozupi.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/bd6254428a22f7ddaee53dcf3bd665e5/mejabinitupopuzatuli.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/guvedajedokijowafe.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210731112959.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7296c4fbe0---81116387490.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610be38a8f4d0---wisitewojabirewuwitu.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160d920d2e9d50---penezuril.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_off0000cd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5C 16004 bytes
SHA-256: 8e041a0c257deba70a90bd4af6f169a773f86bfde8143585f5438c869d252b5e
font_01_sfnt_off0000f642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF642 10812 bytes
SHA-256: 3deebdb3f87f2461dfc04a7c0a735612d96f228691b9c7dc835c4a707dc35f38
font_02_sfnt_off00010f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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