Malicious PDF — malware analysis report

Static analysis result for SHA-256 fead4914c796111c…

MALICIOUS

PDF

78.0 KB Created: 2021-09-05 04:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5d28bc802ff0983176b7c2a082bb70fc SHA-1: 048104c469df682dc5ffb6b6c68a80beec6cfd2e SHA-256: fead4914c796111cf8eb5f0f9f7f8db9c8b813fc2e5dead54fdea0cea1e5e85b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO poisoning attack. The embedded URLs, while numerous, do not appear to directly host executable payloads but rather redirect to other PDF files or benign-looking content, likely as part of a larger distribution or redirection chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://998.geektic.com/geektic/files/29226807596.pdf In PDF document text
    • http://jr-bang.com/uploadfiles/20210612144359.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/8422243825.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/34325476954.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/e2326605a80d94aa7072f45aebf14461/zewolofizunivolesawal.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/pusonatut.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16096863fbf376---58276817972.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/ed775df1bf19b7ef52a334f8b61ebd64/fixobesuxipuveguzezedegek.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/93078592434.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751acea7fec---32094967744.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/kafokenigumetuzo.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/galavajivelisujesefosaz.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/31ccc0a31e4525458ab0bc017a5c41be/38406635611.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/qae78316ne5lor3p8h0n63n4f0/jokewip.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/zivur.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/lepuvesabal.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/nigavebakufa.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/00776aa9e75412cd287a3d288d9ff668/balugipo.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d20f457f8ab---76422243208.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8cs8ous1dpe7of4d59benj0s16/31251806224.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d80b723f35698190441fd3e009113919/45254860078.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/nugurisutir.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/fc716715228ea7986d8cdb73c4b340b9/vegivesinerilidaxoxow.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b0898ece081---xarosanidat.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/07e76aa6f39ab250346496b3f2954b5f/gexogomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=stihl+weed+eater+manual+fs+56PDF 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_off0000c951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC951 18052 bytes
SHA-256: 6b06e7b60609d5cfc55f2ce55adb51ecfc07dc18d1c66c2a43d69c9acd11389d
font_01_sfnt_off0000f86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11085 11060 bytes
SHA-256: 442cf1d3d0def053efbbcd907e0eedbff92c0eb655b02f41ef1909414f10c908

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