Malicious PDF — malware analysis report

Static analysis result for SHA-256 468b1e35b6ae1219…

MALICIOUS

PDF

90.6 KB Created: 2021-07-26 21:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b263f5e312804002024abd77da86be6e SHA-1: f1108a86be120e499900546ee6d146e87b134a83 SHA-256: 468b1e35b6ae12190ece54d92229aaea56aa908e4a93ca3525119293b479d401
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm that directs to multiple compromised websites, identified by heuristics such as 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm suggests an attempt to redirect users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f36dbd46ce---modajumozamute.pdf In PDF document text
    • http://jcpingie.be/public/files/parisixunajitigedejipo.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/ahlejc558h8mb9p8q31i97o3m7/2502360602.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16078a5a69ccc6---83251735605.pdfIn PDF document text
    • http://gabortech.comadmin/file/67862701548.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/3af941c24803e0debb0320e71aa338e3/kiwinupewagizo.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3485818ff3---fopegojitogisin.pdfIn PDF document text
    • https://actor-conseil.com/files/file/tavadetopajesonidubakesom.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a518920c6bf---1725518546.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210614_F6ED229C6A7157C6.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/85622992466.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/vasabowojuj.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/xenuxojugovubug.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa91ba3630---33580847525.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/mixesumijefutunozu.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/30097789c05e477a9c83373b3a284c97/xukaxojajekexo.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f4a2565d13c98b82d6a81605098a7d6b/rimapafukokib.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5b6bfbf100---tajofamevupobisaditekeda.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f463f33b98f---8495268529.pdfIn PDF document text
    • http://benly-carson.com/product/files/1853991793.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/5380ecc1086197e753bdfba81ad3a147/jelatarebunirozapoxujijoj.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/zoguv.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/44230479969.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/lgrum2r70rvli3bv4gr2kjfftd/difomapudumujaduvebi.pdfIn PDF document text
    • http://gilleyfamilyreunion.com/clients/6/6c/6ce887ac6ce8bbcacf46524318b1f362/File/gobokedonifazeno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=www.aventura+cancan.com+registrarsePDF 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_off0000fd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD52 17624 bytes
SHA-256: a9012ba084c717510f6bdfbd5012a0c31eacad5cfb728e259266de0a33725865
font_01_sfnt_off00012acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E4 10840 bytes
SHA-256: e0af462f376dc6d95f5d00ae6d06317ab73bb30744df26225db66e1a041fed0e