Malicious PDF — malware analysis report

Static analysis result for SHA-256 8498aad084cc814d…

MALICIOUS

PDF

75.6 KB Created: 2021-05-27 18:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b96784afd515eb44ca0692a05518c974 SHA-1: 91298842f92ae8105b3c19a16577251a14641bc4 SHA-256: 8498aad084cc814d95b89f90066dcc2742eb01f2f146293c42cbe2b64cb5bddd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains heuristics indicating it is a browser extension installation lure, a common social-engineering tactic for malware delivery. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan. The document's content, though heavily obfuscated, appears to be related to 'agario bots free', likely a pretext to trick users into downloading a malicious payload disguised as a necessary viewer or update.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/6752cb456f5fd4090c454ed1321bb4c2/49437712008.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070f1b442a59---pezutodofemo.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//97390924637.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608768a03a9aa---73329180245.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/fv7bbh2tfvejm113dsldcdj2oh/12383747803.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b822d686f9---96677221541.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe8eeca0ec---24950295347.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/palitaleruxadasijamol.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/5rbnqrada8cd7safkluqnoa8ci/96763937240.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/c44e9b0d64da55f1a250d013ad983817/13459012498.pdf
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/tedom.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/15bc1a725236331bf446afac47f71ee4/lunaj.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071d2661652d---nawufofa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+get+agario+bots+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dacb.bin
13fa128bf5b092dd373895e96775b04648ce97863a79597a7f492f8f3b10f947
pdf-font-stream PDF embedded font (sfnt) at offset 0xDACB 4780 bytes
font_01_sfnt_off0000eb30.bin
8395faacaff001ab8fe70423fa6e7e6a27272dc0def5a71c32de93dff22f8667
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB30 12180 bytes
font_02_sfnt_off000113cd.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x113CD 4324 bytes