Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa91d27ec0d432d…

MALICIOUS

PDF

89.6 KB Created: 2021-09-07 03:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 893b4a8c4099cbe2a4ac94021c780124 SHA-1: 0124bb87d154fbd945fad3fc9182bd9540957bbf SHA-256: faa91d27ec0d432df1c6427ff2e1c1e41b5d9e1e0e4419c79bea9cdcf6e29120
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The PDF structure itself is not inherently malicious but serves as a vehicle for these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bharatceramics.in/ckfinder/userfiles/files/tozaji.pdf In PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ce52b53b6---bumejikefure.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/e4hdh4nkh9uo1jf1abiq43itd2/tonubarizame.pdfIn PDF document text
    • http://upbfassadenbau.com/upload/file/33453394191.pdfIn PDF document text
    • http://debten.net/UserFiles/File/27627129425.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/piwalom.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/towakenosi.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/lawugadixaduvimisezimofes.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/29049f7d864e48923fbaa699a9a10225/77329178676.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/67921819989.pdfIn PDF document text
    • http://armanetti.com/images/72088101559.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/834beb1decb5f6293602537dd26155e1/rotudufolafezikudazonifo.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/d93f7b38f297b19b3ca99306170bc2ba/dititadoriw.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/veroledilawu.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/depabixafofopabolozitad.pdfIn PDF document text
    • https://actor-conseil.com/files/file/96120402326.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ec055b4e9---bidilivilimotadafixewuvaw.pdfIn PDF document text
    • http://skikk.be/app/webroot/files/userfiles/files/wiforifotivabu.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/musokugago.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/64868681577.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a072a122013---9852774829.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/82016b46d2d4f9fc5e1825705906487b/24027539696.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/86104763541.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/mesenus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=edulcorante+natural+stevia+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_off0000f51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51D 10764 bytes
SHA-256: 846562353dc335c62b6595ecf360bbed0af9cddf222bee959676f68f9dac72af
font_01_sfnt_off00010dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFB 19340 bytes
SHA-256: 9b862bc1118b3fd81bc82bcaf8a9c63e17a6fa924dec8da2a25c2a3b6173dd58
font_02_sfnt_off000140a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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