Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ec4ef7114ff2f6…

MALICIOUS

PDF

65.1 KB Created: 2021-08-25 06:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d7c1d9bfcf719a9d0eb8da227bf76f4d SHA-1: 12f9a58722d6e85394a328ae0dd1a0f86963d0f0 SHA-256: d8ec4ef7114ff2f6d45f4d8696fbdb0632b4c54239ac8756b6998fef928ac495
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9088

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 http://www.cda.org.hk/ckfinder/userfiles/files/14072815401.pdf In PDF document text
    • http://casaatlantida.com/userfiles/file///83288322293.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/cabdfdec47281ffe5ff7560790f44690/26995244973.pdfIn PDF document text
    • http://ccmyungsung.net/userData/board/file/dakim.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/84739819756.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/48189313817.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607086e4ee180---legizajebixababibeweminim.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/b1b462d96ca4fbb4637a326c3dc82451/jepiwexotimaxeneveler.pdfIn PDF document text
    • http://gibisch.org/files/files/97578275398.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/26960664063.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/43833193567.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/gabebo.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/kka68u5135c68grnpl670po3dg/momuxivonoturud.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/65760705245.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/kokoxubisopaju.pdfIn PDF document text
    • http://goodmix-psc.com/userfiles/files/jugenavemodisas.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/muvobupagu.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/0qf4lbi166mh6qsfborj9t8597/23120122763.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/2400005955.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080072ab6693---kosatun.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/liwasu.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/28220071144.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/d16d57e9aef7517e40bb0eb442d334b8/xemuk.pdfIn PDF document text
    • http://ropesadventure.com/d/files/56544130018.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/gugudidabotil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=to+fall+conjugationPDF link annotation

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB89 2064 bytes
SHA-256: 5221cc56e96b657ff7c15f49bf1fbf1b5222e15cd7ffd769ce953162a3e53832

Open this report in the interactive analyzer, or submit your own file for analysis.