Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa85e916e5549c3…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 19:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 881a7d4969cdf76fc3d7bef2b1c07f7d SHA-1: ba6e1cbe21eca3adffd30b6b136ba6bdd5c0d79d SHA-256: 8fa85e916e5549c33257c461ea9bdad2e8da09a321bfa021ab7ae0cc7af8076e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress uploads and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://pixomot.ru/uplcv?utm_term=moba+mugen+ml+offline PDF link annotation
    • https://censcakmu.org/board/file/files/19945678976.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/fipapa.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/19856765178.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/garin.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/6a6cea24ee56b838015efd65c20d1d28/35868639472.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/ol492reks9qpah9doc05ql7e37/lopul.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/56764849735.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/miled.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/20019447764.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/peramaxilijebuvuragavon.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/85658142873.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/98122191628.pdfIn PDF document text
    • http://contelex.it/userfiles/files/zuzisufe.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/v5aefk65jdldb5h50bf59qrd8e/janizivuwuzijew.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/dazode.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/61492261468.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/binodagomoxuguxigixivi.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/60262862096.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/norelurifibexukuxakuwon.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/16655992853.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/n0f4aq96bk4vahla720fm5b5k0/voladamipazuxajeredom.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/68147574269.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/voxakolurokurisoj.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/88247424882.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391f041cad2---lolivexexowalasakejomasax.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/b1b743bcbae576a35373f870ac69d56d/vibuzibetiza.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/98584316978.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_off0000d492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD492 10424 bytes
SHA-256: e42f36bc2d79ca90063fa23dfba59b37d1966a783b80804187c707d11090cfb0
font_01_sfnt_off0000ec22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10434 17424 bytes
SHA-256: 0c79bacc7457897e74bac58d320fce6dcbdc7388371ff8f3465db6a5d17dbd29

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