Malicious PDF — malware analysis report

Static analysis result for SHA-256 4668f8e8b2918cd1…

MALICIOUS

PDF

92.6 KB Created: 2021-09-22 21:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 505c9072f716e2e9cc505eb963b9e015 SHA-1: fedf45f66eb1872fa4e92b45effc5d02f6fad20e SHA-256: 4668f8e8b2918cd11be6708e449aa2c471bc1ad025435e4eafc95a79295cee0d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 7

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://fullprotec.com/ckfinder/userfiles/files/97819464145.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161484cd131ec8---18667113444.pdfIn PDF document text
    • http://yibetter.com/data/files/zitivap.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/tazokuwubagabeju.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/kizopiziluzixerotumab.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/laxujijew.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/2323487640.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/daralabomijesezuzigiwuri.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/jivawulamiterixunu.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/25706645186.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/53416988578.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/8ccc0097fd08903189aa5497e811dba0/2061781492.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/kabugijesizi.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/muxebemobinojixu.pdfIn PDF document text
    • http://licausi.it/userfiles/files/vagasirefimu.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/85333665248.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/rutimepapirozutozavubow.pdfIn PDF document text
    • http://skalamatbaa.com/userfiles/file/kajefemajosirudutipunuvol.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/2521516788f03b0f61b6484b526cf641/71793994231.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161492add31ddd---84810271673.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/53928573901.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/99023390515.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/tewowe.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/munomofifafilagovuporuro.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/45984856308.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/29805125492.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=scarface+full+movie+freePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10853 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001206a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206A 10368 bytes
SHA-256: 151faef9dc545be714c405ccbb15ccc1b14a1843e9465614a3bc4a05aa907af1
font_02_sfnt_off000137e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E0 17228 bytes
SHA-256: 8a8ddd681c3a11b5083f265db2d84832dc1607b8494192cffe23c5308055f1f8