Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a9346252d0c899…

MALICIOUS

PDF

85.5 KB Created: 2021-07-28 10:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 856e26c44701dbe7fbab45e4d0957d41 SHA-1: 7d328a9813f409e9c270ff68c9832a6f2d0ce1a7 SHA-256: 76a9346252d0c899141d32a7993f983ad7665cecb4509eb4e616d0b66c935634
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised or disposable domains, suggesting it's designed to lure users to malicious sites. The presence of multiple PDF link farm heuristics indicates a deliberate effort to obscure the final destination and potentially distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://idroter.org/userfiles/files/lusarak.pdf In PDF document text
    • http://autovoda.ru/upload/files/40906794033.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607583c8f4059---27012457603.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/rexasarasot.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/74777923592.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/88762915fbe2b0c1d11e4425b152b9e5/diwak.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/suloriwopa.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/81665219945.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/memumezafipifotomanap.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/kopejir.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/46349189890.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d3365bdf220---tukovomifibex.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/24484287083.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607db8663525a---rekisem.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/pavisifuwezizokupuwal.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/dalip.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/1405b2e8e178c2666f3e037126ae20fa/65533373261.pdfIn PDF document text
    • https://flyags.com/editorResources/file///17313914938.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/rojelup.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/41420889377.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/a602ece4c636d46a5e28d073173b44c8/digonokanos.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2940ee9702---lazepita.pdfIn PDF document text
    • http://cooleywestbrook.com/clients/865832/File/liwapititewinomiki.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094b86cd6a88---sopavudinopepewimezesada.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/51800316829.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/06505d18ab813a7357409d29318a7134/jeloxetosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=tableau+des+mouvements+litt%C3%A9raires+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_off0000e494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE494 11084 bytes
SHA-256: 3aa25b9a50865aa3b80341fb54f6285e193a4a85f491cf68e4fa055eac566a3d
font_01_sfnt_off0000fddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDF 18992 bytes
SHA-256: 9586c527d79c1f2774aba85ede786c0d508687f9d54b246d2ae9f42f354058c9
font_02_sfnt_off00012cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1