Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7980f2999d3dc80…

MALICIOUS

PDF

87.2 KB Created: 2021-09-04 20:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 798d830616d1f25a73889e03d7046358 SHA-1: 746e4632ed1a96281f41531c3dca08fecf947bec SHA-256: b7980f2999d3dc806092ac4df40219345ecf6b36315c95085b485412ef6969e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it as malicious. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://tscyw.net/userfiles/file/20210702005528_fgeo9t.pdf In PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edbba34af0---81001060888.pdfIn PDF document text
    • https://europartner2.pl/uploads/58893232044.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb68d54cdf---60038433874.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/98327562985.pdfIn PDF document text
    • http://toroisg.com/public/images/files/64955884627.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/nurazisokizevewamabo.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/81736678165.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/82574073356.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/pokuwupalakibopa.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/93746229797.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/9e636e80173f088fa479cdae1408f18a/96894772365.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/nusatukusutaz.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/zisonejegum.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/xipoje.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/xujokavuzelok.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/13918490834.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/3457080731.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/90928113255.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/26141742448.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b9db354c356---22783018128.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/38416561571.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed9a4cf2add---14762347575.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/63749051243.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b8fff221f74a633091d72f9967cd9a52/20323063144.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/14942938178.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/90884577824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=materialismo+enso%C3%B1ado+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_off0000e7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EE 20628 bytes
SHA-256: bd3d46d6d14e4acd0106f9b0558f98fb679e65f0ea975095819305ec828f27ea
font_01_sfnt_off00011ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BC 10856 bytes
SHA-256: 25f1139a373ac80f0ca5e8ef7f6031757d86dd03f97a197c0513fffa77da945a

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