Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b631839bc096b2…

MALICIOUS

PDF

78.1 KB Created: 2021-09-07 20:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 788027e2bfa937ed688ccecdd44ecc0c SHA-1: 5d1a1674d58a5411528830df75207f98cdce7579 SHA-256: 36b631839bc096b21f106dff7b19ae3b81ae101c72cb942574082a13efe2b404
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a significant number of external URIs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript further suggests malicious intent, likely to facilitate the download or execution of a secondary payload. The ClamAV detection as Pdf.Phishing.Trojan confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3497

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://drafthe.ru/uplcv?utm_term=handball+rules+2016+pdf PDF link annotation
    • https://akanaymatbaa.com/calisma2/files/uploads/joxofojurudakiriroputa.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a69df3888bd68b7f227419ab2bc54bd/luputigixotedol.pdfIn PDF document text
    • http://hidropro.hu/upload/ziresuzokeb.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160eca0432cf6f---59426212097.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/fexawixevuke.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16132abc505b1d---92161768068.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/78373598874.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/nofifaza.pdfIn PDF document text
    • http://charontrade.hu/data/file/68758970752.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d045c49a95f---43725257675.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/36468105689.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/63975300731.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/47874ce69641edc6418486de9d13d1ea/32167129202.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac37c17256f---zogegineb.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b13aa44e3a1---4879717229.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210720_522AF9EA508CF9D4.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79e003bd65---jemajagokafavovuxab.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab850adf292---91517187904.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/xofoxuxufemedov.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611533ae6b6db---mijawedigo.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc205b4bda3---renam.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/36b841118645508a49c6e782894630c0/dotowokikitok.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612cd38c8fe41---vesalokakis.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62D 17524 bytes
SHA-256: 95c79e9ae1f591f6314bb0f4a70a82c5316a1efffa2c98722bb5a6e46dcfb3fa
font_01_sfnt_off0001137c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1