Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c8c54ac19e75cd8…

MALICIOUS

PDF

80.0 KB Created: 2021-10-11 12:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4a6086911d4f78e558989389ff94032c SHA-1: cb2c1e54c991573aba1d3d787d6dc3581ee3899b SHA-256: 8c8c54ac19e75cd8aa042939fe1797644edb4c0650d0bdd415ec29cd122500c5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6111

Heuristics 5

  • 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
  • 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://sakura-bashi.com/uploads/files/202109090403571442.pdf In PDF document text
    • http://gzmzwl.com/Uploadfiles/files/zolifatalidolezoto.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/30836202655.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/wupidolonuje.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/a6400a168e734980e1c4ff74598a5c66/zuruvexuzoripisufufaz.pdfIn PDF document text
    • http://mlsite.gewoozee.tw/custom/file/tanuzoriziwekajuwisemu.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/8852628986156fef272041.pdfIn PDF document text
    • http://signauction.net/userfiles/file/denupenin.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161569bab4329d---34187273513.pdfIn PDF document text
    • http://zubrcup.by/files/files/wilenerurabigixojunena.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/211005000556965452kdkeu.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/31410582427.pdfIn PDF document text
    • http://sga.cc/uploadfile/file///2021092517132061.pdfIn PDF document text
    • https://ijp2.com/contents/files/rugamekaj.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/53520201289.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/59224485543.pdfIn PDF document text
    • https://spacio.hk/attachment/file/dexalewuta.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16144e047bffe1---11014618259.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/xutogagifaluwekofasidibo.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/85074820319.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/kaketili.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/5333081290.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/58007816717.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/cmwvf4RlXg4/uplcv?utm_term=better+be+good+to+me+livePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AE 10416 bytes
SHA-256: 6a2f4bee552795daa19525658d482b28cf454f4856e80006c23b80ba1ce6a851

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