Malicious PDF — malware analysis report

Static analysis result for SHA-256 a217c927c589b7f8…

MALICIOUS

PDF

76.2 KB Created: 2021-08-23 16:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 72252e329c192123516f288d4a7255d3 SHA-1: c57723ca8354f52cef0340e6dfb693867f88177f SHA-256: a217c927c589b7f85ccecf376ea8707827b0b02fd95aa196b1bace1dde83e0a5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains numerous external links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8598

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 http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/jerogipeboniruwinupinu.pdf In PDF document text
    • http://nwatchonline.org/userfiles/file/72300962565.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/20218211741157297.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/papilozepibudavagumuwinox.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608016598baa8---noripaw.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/wirotugo.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160db1ca89fcdc---sinejerosunuvijofafil.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/xudodutudixobipoxibipuvuf.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/fedenubapefasopoviri.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/kijipeganozosi.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/molomesejinidavolupinati.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/duxaworanigo.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/luluvexafiv.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/02e21da3db72b377e2a5228430900f44/titujexewojan.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c733d71852b---meviroxawejegiwexajikew.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/97288ab672eb43efd09dacafef682166/navoranilawozinuf.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/f42bda9d4a04660383aef673cbdc9912/sitetisunisavigeg.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609c194218ee1---55822486754.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/620f916de4b5a151654418ee191b1f5f/ravodidiwelipinadid.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/0dh5u1uol3bkrcaj5inl86daen/perewaxatelevudejelofeso.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/kd28m6ue2poue3flqujj2j926l/zogaxixodixomelazoba.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/vosofure.pdfIn PDF document text
    • https://latework.cz/soubory/87883465525.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/33598356311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=channel+tunnel+drillPDF link annotation
    • 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_off0000e6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF11 10188 bytes
SHA-256: e5f15c4d75b6944bc00b5b2a9cee2ca5ab153d823bdbbaec1e655b75b4d06a8f