Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e5dd20873a889e4…

MALICIOUS

PDF

70.7 KB Created: 2021-09-14 12:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b22ef93beefdd667018d9748307e94a4 SHA-1: 6180db149e6cb39c7df8a98caa7e0854f0e17ac3 SHA-256: 4e5dd20873a889e45b1215cf194dcb3bd16e72ef0bbd971c718bfebf502a2f72
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple URLs pointing to compromised WordPress sites and other disposable hosting, indicative of a link farm used for phishing or malware delivery. The ClamAV detection and ML classifier further support its malicious nature. The embedded JavaScript likely facilitates the redirection or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6691

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://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/39401142431.pdf In PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/71838333274.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/58412264206.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612efb89a6296---63806446122.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6249a7523---muwumigitajole.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/47082495560.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/6decda64c762447ba376d1803778c1ad/34933380636.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/xonavafuluwovikitufajo.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/rinugotojoriwiwim.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/68552913634.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/45633865348.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/b26e71cadbe5ed11782f8924245c3608/sowetafodoradotetomatuluz.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/1c3olutp46s0kukn8f3d8c960d/kilizuvelatuzi.pdfIn PDF document text
    • https://maisonforville.be/documents/file/96875447108.pdfIn PDF document text
    • http://muszempilla.com/files/file/42668528658.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/28468045714.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/98179261182.pdfIn PDF document text
    • https://stormester.no/files/file/91166891248.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/navejunededifosurapefozu.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/27690577119.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303505e7f48---limadivoput.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/85151505536.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/a85291sk42hptqoe7fkqt56o35/6489977995.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=black+love+signs+book+pdf+free+downloadPDF 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_off0000f27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27C 11136 bytes
SHA-256: bb51d1eb4f4f7f92438414b853373c938a929c3063f61071ab0745b9585368ac

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