Malicious PDF — malware analysis report

Static analysis result for SHA-256 0adca527592952f0…

MALICIOUS

PDF

62.5 KB Created: 2021-08-08 14:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ca570f5147802e22a03677c161c2a5b0 SHA-1: 98e05ecf92d26ba5f383f775683ed5e62a8ebe64 SHA-256: 0adca527592952f02c4b9076bf71af87cabd1357711edb3231df5272a8359543
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to one of the numerous external URLs, which are often used for phishing or to download further malware. The PDF also contains a link farm pointing to compromised WordPress uploads, further supporting a malicious phishing or distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9069

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 http://inistor.com/ufiles/files/zigunudik.pdf In PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/2107220107502518334slos.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/ropirapelowakerexonitufax.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/50119952290.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070025135db6---vusemutu.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/28234288976.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/8hm1jg1mqtlt49jk7710jfv50q/zesujefupivatixexebu.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/46404199930.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/82b260c41c7a7b06a22710bb9045397a/nisuxotigusetorofosu.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/a3eccd14724637bacca162d2b0e28f1a/lewowikuwududir.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/regifekozafuku.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/dukopizonuzomizim.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1624359866.pdfIn PDF document text
    • http://builderall.info/userfiles/file/tixeruridupujagewukufozup.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe41d7ddec---93680255449.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/hnnbv1dg8i84kebh5t0riavqj7/820109130.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/memunisesinosonamadi.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf45e8bc2d---vorowezisodugana.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077efe05f6c0---xiwijenegaporemoxemila.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///12630848061.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021052211293447.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/jaxewufuwoja.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/13488733600.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/58616593473.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/8d6cd2c9fc839d6df8239fa180e8919a/fatune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+set+up+a+bestway+poolPDF 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_off0000cf1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1