Malicious PDF — malware analysis report

Static analysis result for SHA-256 366cfff2a3473175…

MALICIOUS

PDF

76.1 KB Created: 2021-08-07 03:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e907daa63744f9c5d1325ab6aadd313e SHA-1: c05454b49e97a8f9edf5647a09ec6a019764d839 SHA-256: 366cfff2a3473175c29daeaf99205765d68773aeb06ed18343eb53843be7a7b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations. The presence of these links suggests an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/9a900baa99a425247d58d8a2891c5734/13152570174.pdf In PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/0a57efji5vqftbiou9l6qgnt34/lepevutitexidosupajujul.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/8559333563eac888664153fa77a161da/52633918481.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/86827224837.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/3a7ae823d724b6b082834f55da5c2de9/48978741064.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/6966f480c93653336cec393fc59ba4a2/95189198672.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0eaaf481ea---rivir.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/waxofukixebuvobibet.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/xozopewusuge.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/ppj4mihv7a0m6sav0a8tb3l3jh/bodupifukuzakixil.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a153e82b5f---ridozi.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/49007020766.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/b8613cbd04bffd247e92d5fa1dc7e42a/nilireriburu.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16084f504ad573---nosefuvuxawa.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6d52330eb---73103286609.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/a4c95e1f3c8c9fe3a90d862b86b1a3ca/52491466736.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad9b2b8428---55400251874.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f25b2eccd54---5540737987.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/41677012696.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/1820663886.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/36295498584.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bujadapoligojasenekunife.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/72538887162.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/xafabusomerug.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/pokizelejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+get+minecraft+java+for+free+on+androidPDF 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_off0000c7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7ED 10880 bytes
SHA-256: a8da37f544d6e9b26d00d17589b3330e862f4571611554837550febf6b2b840f
font_01_sfnt_off0000e0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D7 15604 bytes
SHA-256: c65792fe073e63971d7811ec6f92b30157c9bb5b1842c7517f96d5b3aa8d95ef
font_02_sfnt_off000108d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1