Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5dd02902f34c21…

MALICIOUS

PDF

85.5 KB Created: 2021-09-02 16:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 765f81d8eac81e4cd52569abf44309f7 SHA-1: 91197dd987d2299237d3249c83d8cfe49e331fcf SHA-256: 8c5dd02902f34c21c4cf0d931b378b4e0ee8260657887bc0c4ab275b5be44422
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, which is often used to execute malicious code or redirect users. The PDF also functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains, indicating a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4864

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/1cfdb45c2439b305699e5310ba8a1e49/35394606613.pdf In PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/66829062949.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/9e79a9e37d5bbff5a95e12992b000fca/95220528116.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/dogutobuvuj.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/bomopakamupotu.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9f9be2751---sefisor.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/mikibusazo.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/wobimulor.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b54c377c540---zefibojofaxokavabona.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787f4e256bd---wejetotapase.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/meropadigatibunanuwedamim.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/3gpq88dg9emm1j11reclcu68ju/91927473162.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/d0b580967fbe2ccacdd6e723b814c4af/77576474811.pdfIn PDF document text
    • https://cecprint.com/images/file/15324387192.pdfIn PDF document text
    • https://hsse.cl/files/faposisukosikugijuxexadi.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/70607098915.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/737e2df10b3b8440c859886c8e495800/54048717861.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/83578946086.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/dejeredunobagudukobe.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/18934866224.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/liwupatifezumupatuf.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/bawurunazixozebipasazosug.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/709599235610fb1802dca4.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608d68e78eda9---bujedapuzorulofagofux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=cours+sur+l%27automatisme+industriel+pdfPDF link annotation
    • 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_off0000f30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B24 10824 bytes
SHA-256: f57cbb7d75e915cb508e0833fa89acbb9a8e954c2e216f3a3a2c49e5eed0bf62
font_02_sfnt_off00012429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12429 20372 bytes
SHA-256: ee2269713f4e6aa4fb54eb33c31a855941518821150dc1c59f2b2a33a9aafe8f