Malicious PDF — malware analysis report

Static analysis result for SHA-256 b937e8476239e0a5…

MALICIOUS

PDF

85.9 KB Created: 2021-09-05 11:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 00c42f73263934c6e22eb3b338803d55 SHA-1: 76d1eae41bfd6361f0a0c6c598c5e82f9a7a4575 SHA-256: b937e8476239e0a5fdf927f85ac8a41d26f9fae1b9de01a1421dd191918f3877
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to obscure the final malicious destination. ClamAV and ML classifiers strongly indicate malicious content, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/7d893b9bcb3c1b62095b263725dd4a8a/75061816761.pdf In PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7cd159536---81424397375.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/21765681596.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/7025071653.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/dk3o0atcjo93if9i2f923hnq06/runujafumaradikaxukew.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41b9f74edc---1161265004.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/tva9m19dot2k9ev1ne0gtm4kre/46037155407.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/1iu5m7bt4mojtb9gmd8g60dso4/35236573024.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/b47ab1cb3cf55496da8974fff1b3d373/86721661826.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16095bff3e414e---60959175147.pdfIn PDF document text
    • http://chieucoingason.vn/files/vefufuwegabefizudizow.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/35737475037.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116c0705992a---jevedubuxe.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/0f2677a6434d4aa4aa8a569bb1c79690/39786931752.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/99849123738.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/buselagobipuwaxobugimekom.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/725810ad6b2aa2195a8aa365e2de9e64/viripakolijilaxugaxanapas.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/jepaginalotidi.pdfIn PDF document text
    • http://telecycling.info/files/file/golimefenidosija.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/jerimilet.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/15234399143.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/59df9b6ea988f7755734deb44d3fb0f7/suwopejuwalanumusizevak.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/d0dd46fdb06e835591567f2e53c49bb6/pudonefudodezozowa.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/6c5f36bad3341787429cb5e38d26ad5e/6175010652.pdfIn PDF document text
    • https://technoculture.cz/admin/upload/file/kofaguliwirovakonevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=self-fulfilling+prophecy+pdfPDF 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_off0000e45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45D 20168 bytes
SHA-256: 99b5b528b1085b97afc161264d68aa5cfa251e4f48a9028955f1f37c636ab4ff
font_01_sfnt_off0001192e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13145 10796 bytes
SHA-256: 9a62760f970bc17daa9b18e273f5a9beb1b36e689c67e991c9430e07d18b75b6