Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b7da77360653e2…

MALICIOUS

PDF

74.4 KB Created: 2021-08-07 01:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 510346f1afd0580920cb78c73fb39a56 SHA-1: 6c8c5b761b6e9ef41a4a0e0952c9676b09e07918 SHA-256: 05b7da77360653e2fa84187693e5f53c846f0fb24a39a5df919741c83acef08d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient evidence of a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • 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://smidgel.ru/uplcv?utm_term=bolens+mtd+riding+lawn+mower+parts PDF link annotation
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609918793b5fc---zuzukajir.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/61165853664.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site//site/data/files/kexalowubidinutekos.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/53sd8tg3rlirdk51bie509c9is/kolugiru.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/kelekisi.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/80c28d577596dca90fcbda7e2b483245/47691396966.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705075c2472---nuvuvog.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/fabif.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/nigapim.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/5as8f8rjhein9ntm26q95hhuvh/13355066770.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/98179257430.pdfIn PDF document text
    • https://wita.lt/images/files/38589118570.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/sogubiwigomedevizijix.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa05175e22---dojakosiwisorolonowatule.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33469757104.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/rumusexazezulinoxuxi.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/536l8qg2ufv99ff4u4t4qa4aeg/vesirironozolaxawo.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/92971303180.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/27158835438.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/6caa5b5bd5db6ecad60ee7979aec6af6/surikuzizimufogekidikuraz.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/11954529490.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/9701fdf768d5d37314f8ca962dad0672/18727662439.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/63442222199.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/90043283376.pdfIn PDF document text
    • 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_off0000bdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD8 10872 bytes
SHA-256: 77f36499d2569d4ffe2ac71274a699dfdec00668df2de2d4c5af8cb3df8e41b2
font_01_sfnt_off0000d6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDF 17208 bytes
SHA-256: b10de585b0bde878155db5249034727acdc4fa3f3e0bffb8703a9b6ef0afdeaa