Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e083fb9f342c9e7…

MALICIOUS

PDF

93.9 KB Created: 2021-09-21 00:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8fbaf4e589a7c7cb16978b2bf896eca6 SHA-1: 3a250f9b5dbe5c0dad631493f8419ea613a8383a SHA-256: 6e083fb9f342c9e7a439f1ae2a0446078632e84cf279f3ee5991f57b242af0d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment used to lure victims to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://catamma.ru/uplcv?utm_term=fear+the+walking+dead+episode+11 PDF link annotation
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/9d8fd754b872be5f8173955777c67071/dimopevijumujujeko.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210904090950.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/jalegefirobaw.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16148ae9880e60---85145136311.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/krulqschs42c3mfda22jm6obd7/tojelivupibiniwis.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/pewekurexopakamab.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/dudubelekokat.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/89893163915.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210918082144.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/62750235420.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16130f58cc6b7c---xirubedejipigibi.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/35107056681.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/kusorekifijuwivawugabava.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/laxipojawuzet.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/mexubanapemev.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/44647471689.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/68169445776.pdfIn PDF document text
    • http://coachhouse.info/assets/file/12548546728.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/dimibopirebirixusov.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/pototibawo.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109072312535778.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/98165519614.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/rezegisoligotuninenixu.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613627490ad6c---mofexe.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210902_12AC98F44615FB2D.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/wisinufovutidefu.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/maludizanijemetefuji.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_off0001083f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12051 18704 bytes
SHA-256: 9ff031006597dee8a10e110809c4acdcb526eaa9f8b5d19fc48f3903ff34dc28
font_02_sfnt_off000150be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150BE 10876 bytes
SHA-256: 96448d763286df01a3150cea0648c9740b73e508cc8d8aa157d0d2ddf922b3af

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