Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c914d856bc36bb…

MALICIOUS

PDF

72.1 KB Created: 2021-07-18 14:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f8621f66826cc40c1ddc90b351b94d4e SHA-1: 95946c43b1bc99b60636b7e18d22734b47948cb0 SHA-256: 35c914d856bc36bbf83a2b73e04bd3c5d5382c097f6e59ed859795274d0b4f54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites hosting other PDF files. This structure is indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/4eb2f4cd5c75c8161bb78127a530c915/sobogige.pdf In PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/3975439684.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/19430153195.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1624133480.pdfIn PDF document text
    • https://genegurumiraclehealer.comuserfiles/file/11173982631.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc34c5bb93---mexirerasuku.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/gelarasewisa.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/f88064f514ffd2375a51b18c3bf45632/gokixa.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160946f5002aca---96196098531.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/wowabasufifagonuwumisagad.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/2c522b732956e5b892629e07fd1451aa/55709913491.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/domedofafo.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dca4f85485---segazizomevixilevuweweki.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/zodipu.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d039ddbd4---27701325268.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160964490ca9cc---37061730534.pdfIn PDF document text
    • http://jaatkinson.com/userimages/fenutefirugotigafo.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/08ccac0dd1f1a7e3aaa77945c78cd72f/warekomakubivipaw.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/bewuzetowet.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/2ecade317023000a3cb56e0e83c22fae/50146085218.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/0b31ff64443503c07ed9dff4de187c2d/65625382172.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/ramagofubowenogerekidat.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b12ce44e65---12872431926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=converting+docx+file+to+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_off0000b78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB78A 10664 bytes
SHA-256: 9a8f44c6ea3ba55bd34bb629aa98441b8370ad42ef957c934c656b389f445cb4
font_01_sfnt_off0000cfed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FF 17308 bytes
SHA-256: 7701e9e19ec691e35d27df292920c80be9fe898f63855a8428daf62cda54fe23