Malicious PDF — malware analysis report

Static analysis result for SHA-256 35eacfec3d00f2d3…

MALICIOUS

PDF

82.3 KB Created: 2021-09-01 13:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c3da81fcf189b2ae5cf6edb42615cb60 SHA-1: 65ade427535aaecea3f572e66a8de6f84c219556 SHA-256: 35eacfec3d00f2d3f3682a4bcee7fa268f37dd9afe299963f5d2e695e1680c8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's used to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7aa642e2c---witaxarowosogidir.pdf In PDF document text
    • http://geologocarmignani.com/userfiles/files/wigezemo.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834971de75d---29560034759.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/wevenoxuvepejogubosij.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/jolixegojexibufekujowu.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/b6335a1f0fd6f49a8e2b9472149c79e0/61015625956.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/7a93b8a2f8b7549aa244e72c3d7f75f0/loserusifilalaj.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16077572a02ad6---xirulomopegipugusu.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/tq1392crh4bbreg0pgk8f2rbar/82079535575.pdfIn PDF document text
    • http://dakmet.pl/upload/kanazuwulat.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fb9e1401d---69054929521.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/730680165.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/7jk3b7k01tvps6gql5hmofnb76/falelatitufumumivexot.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/fakamiboxobibisixozivigup.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210702083419.pdfIn PDF document text
    • https://murtenhof.ch/userfiles/files/45918897437.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/farafidasilomunexobu.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/35265196567.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/vovewuz.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/muzekinemubat.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16113f7d58e0d6---73479084204.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sumafilixovozewapari.pdfIn PDF document text
    • http://chikatere.com/Upload/files/lowilaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=perspective+in+environmental+studies+by+anubha+kaushik+sixth+edition+pdf+downloadPDF 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_off0000dba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BA 11584 bytes
SHA-256: cb13f25324995a00811a60075e54f1229fb0a7385d5be52d82508ccb4aaaedc5
font_02_sfnt_off00010eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEA 16832 bytes
SHA-256: 4c54ba0af4752c9ad04c6aa2356b38cefd904d95d4da48ab5caba65c927479c5