Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae09d37ac5be2fb5…

MALICIOUS

PDF

74.6 KB Created: 2021-09-06 20:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9e702b10a67a423339f8ce520096bf55 SHA-1: 88397fadd69d54e62349d6d3178819be839debad SHA-256: ae09d37ac5be2fb515129033ba9813f34137d6c141417d9864f0e6c205de2290
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 sites hosting PDF files. These URLs are likely part of a link farm designed to lure users into downloading further malicious content or visiting phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607335c9e014a---sosopaxixakukavisozuzila.pdf In PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/37954938829.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610e5c8bd2b98---56895016416.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f382fefd89---4165191000.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210621162428328931.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/12459f903555a0270852ffaa814d1de5/15881985240.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/ee3831c4af0d8bc4757996443ab88891/63084103615.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986f8da93f1---3443746061.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/tofowimejabaxisupu.pdfIn PDF document text
    • https://svltv.in/userfiles/files/29953760919.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/pibudobupitol.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a736e7e791c---soxuvesen.pdfIn PDF document text
    • http://patroha.hu/file/nidetugerutejovabidowebov.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/mamibifeperazuzajoja.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/8a183ac3287b8e6ac1638c8856f8e1f7/15380374992.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/galukeve.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/guwigofome.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f58f64ddfe7---63231558340.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/824s8fjqh2hcsdqttqlvnnou2o/sikumusifele.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/rabakupoxajetedo.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098b743486a0---sogofixulewotajafigajus.pdfIn PDF document text
    • https://rajatotogroup3.com/contents//files/burinokuvadugavojoxalubu.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/82321648500.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5cfb8dbf7---sakekerune.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/85101049563.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/vokuturarefiline.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=nuance+pdf+converter+enterprise+8+crackPDF 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_off0000be57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE57 17368 bytes
SHA-256: 7a29552e449366c69268261123deecc0e27495f255b5110b2a8308704204ce47
font_01_sfnt_off0000eb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB01 11008 bytes
SHA-256: a19e0f6fc9f27c2ce82ac438f8701e529546649dea48133c286c2cd39da08dd0
font_02_sfnt_off000104d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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