Malicious PDF — malware analysis report

Static analysis result for SHA-256 752597b9c6faeb03…

MALICIOUS

PDF

67.1 KB Created: 2021-09-06 16:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a6de827c1664105dc733b5afe1c28f1b SHA-1: 43742c062f3e98925baba14f77cfe2dc9d96de5a SHA-256: 752597b9c6faeb03a251db86b95787db912d38c0d00d04221178123ee1466618
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains. 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 link farm suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7675

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://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/654ded82e3b6920f14093cdc9c9d26e4/28313151955.pdf In PDF document text
    • http://carlaschroyen.com/content_docs/12573669828.pdfIn PDF document text
    • https://okazionche.com/files/2055706390.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160de5423bfc2d---20754786926.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161299d4eaa09c---zurokiju.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987caf601e4---68317195134.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/874096647.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/a8f8918fc67c32c1973e2cc779183522/tonozederazanotaguvi.pdfIn PDF document text
    • http://oprfhs70.com/clients/879438/File/juzuzolonajukudanajipexow.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607593e8ccbf9---44958729911.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/vozexafuzidemuzadeboxadob.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d55c7ece5d---91775947612.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/xeziwijugekijubufusukopu.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ada0ba034a---fizotazepag.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edc9be39a7f---24904565997.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b32b98b00df---95856351023.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/vuluwurigawalekelavulege.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/af2f26c766007f608bc884054ee310bb/rororarunale.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/86625991154.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/xuwuzopinunowuvobezufubir.pdfIn PDF document text
    • http://hotstamping.pl/files/file/38027277546.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/m79i5vni8rquvtfourp55bda4h/buvakobego.pdfIn PDF document text
    • http://freeski.hu/freeski/file/54799664675.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/18669569754.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/bokitu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=hepatozoonosis+in+dogs+pdfPDF 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_off0000f8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1